多恩布什版宏观经济学英文练习题
Exercise 多恩布什《宏观经济学》配套版讲义
8) Which of the following would be most likely to cause a change in the natural rate of unemployment?
A) changes in monetary policy B) changes in the price of oil C) changes in the percentage of labor
E) An increase in taxes causes a reduction in demand for goods.
4) An increase in the reserve deposit ratio, q, will most likely have which of the following effects?
D) will cause investment to increase.
E) will have no effect on output or the interest rate.
14) For this question, assume that the saving rate decreases. We know that this reduction in the saving rate will cause which of the following?
B) The IS curve represents the single level of output where financial markets are in eg rate increased in period t.
E) none of the above
11) Use the following information answer the questions below
Chapter_15 The Demand for Money(宏观经济学,多恩布什,第十版)
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The more money a person holds, the less likely he or she is to incur the costs of illiquidity
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The more money a person holds, the more interest he/she will give up → similar tradeoff encountered with transactions demand for money
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Standard of deferred payment
Money units are used in long term transactions (ex. loans)
15-5
The Demand for Money: Theory
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The demand for money is the demand for real money balances → people hold money for its purchasing power
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As liquidity of an asset decreases, the interest yield increases
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A typical economic tradeoff: in order to get more liquidity, asset holders have to sacrifice yield
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At the end of 2005, M1 = $4,596 per person Debate whether broader measure, M2, might better meet the definition of money in a modern payment system
多恩布什版宏观经济学英文练习题
多恩布什版宏观经济学英⽂练习题Chapter 22. Assume a German tourist buys a Mexican beer in a pub in Houston, Texas. How will the U.S. GDP be affected? CA.U.S. GDP will be unaffected, since a foreigner buys a foreign product.B. U.S. GDP will decrease since the beer has to be imported from MexicoC. U.S. GDP will increase by the value added at the Houston pubD. U.S. GDP will increase, but only by the sales tax assessed on the beer7. If nominal GDP is $10,406 billion and the GDP-deflator is 110, then real GDP is about $9,460 billion8. The GDP-deflator and the CPI differ from each other since CA. the GDP-deflator does not include services but the CPI doesB. the GDP-deflator includes imported goods but the CPI doesn'tC. the CPI measures a fixed market basket but the GDP-deflator doesn'tD. the CPI includes more goods than the GDP-deflator does9. Assume you desire a real rate of return of 4% on an investment and you expect the annual average inflation rate to be3.2%. What should the nominal interest rate be on this investment? 7.2%Chapter 93. Assume a model with no government and no foreign sector. If the consumption function is defined as C = 800 + (0.8)Y, and the income level is Y = 2,000, then the level of total saving is -4004. Assume a model with no government and no foreign sector. If we have a savings function that is defined as S = - 200 + (0.1)Y and autonomous investment decreases by 50, by how much will consumption change? -4505. Assume a model without income taxation and no foreign sector. If government purchases are increased by $25 billion financed by a lump sum tax increase of $25 billion, then AA. national income will increase by $25 billion but the budget deficit is unaffectedB. national income will increase $50 billion but the budget deficit is unaffectedC. neither national income nor the budget deficit will be affectedD. we cannot say for sure what will happen to national income or the budget deficit6. The size of the expenditure multiplier increases with an increase in CA. government transfer paymentsB. the marginal propensity to saveC. marginal propensity to consumeD. the income tax rate7. Assume the savings function is S = - 200 + (1/4)YD and the marginal tax rate is t = 20%. If the level of government spending increases by 100, by how much will the level of equilibrium income change? 2508. Assume a model of the expenditure sector with income taxes. If the level of autonomous investment decreases (due to negative business expectations), which of the following will be true? DA. the actual budget surplus will not be affectedB. the actual budget surplus will increaseC. the structural budget surplus will decreaseD. the cyclical component of the budget surplus will decrease9. Assume the consumption function is C = 600 + (3/4)YD and the income tax rate is t = 20%. What will be the effect on the actual budget surplus of an increase in autonomous investment by 200? an increase by 10010. Assume the consumption function is C = 200 + (0.8)YD and the income tax rate is t = 0.25. What will be the eff ect of an increase in government transfers by ΔTR = 100 on the full-employment budget surplus? an decrease by 100Chapter 104.哪些政策会使IS曲线变陡峭并向左移动?DA.货币供应量的减少B.政府转移⽀付的减少C.⼀笔税收的减少D.所得税率的减少5.LM曲线左上⽅表⽰DA.商品和服务的过度需求B.商品和服务的过度供给C.货币的过度需求D.货币的过度供给6.LM曲线会在什么情况下变平坦?BA.货币需求对利率变化的敏感度低B.货币需求对收⼊变化敏感度低C.货币需求对收⼊变化敏感度⾼D.货币政策乘数变⼤7.在IS-LM模型中,如果⾃主储蓄增加会导致收⼊和利率均减少8. 在IS-LM框架下,扩张性货币政策会增加消费和投资9.沿着AD曲线从左向右运动相当于BA.由于利率下降,IS右移B.由于实际货币余额增加,LM右移C.由于增加名义货币供给量,LM右移D.由于较低的实际货币余额,沿着LM曲线从左向右移动10.什么情况下AD曲线右移 AA.政府转移⽀付增加B.由于价格⽔平下降,实际货币余额增加C.⾃主储蓄增加D.央⾏限制名义货币供给量Chapter 111. 在美国,扩张性货币政策常以下⽅式进⾏:C A.财政部发⾏新债券来融资增加预算⾚字B. 美联储要求银⾏增加贷款活动C. 美联储从银⾏或政府安全经销商那购买债券,以换取⾦钱D.美联储乡政府出售债券4.扩张性财政政策的副作⽤利率上升会导致国内⽣产总值的组成发⽣变化5.如果央⾏固定汇率BA.每次财政扩张后要承担公开市场销售B.每次IS曲线变动时,央⾏都要调整货币供给C.财政政策变化不会影响消费和投资D.上述所有6.挤出指的是CA.当所得税提⾼时,消费⽔平降低B.投资补贴减少后,投资⽔平降低C.财政政策的变化通过改变利率影响GDP的构成D.流动性陷阱时,财政政策完全⽆效8. 如果政府通过投资补贴刺激经济,BA. 投资和产出⽔平会增加,但消费将不受影响B. 投资增长的⼀部分会通过提⾼利率来抵消C. 可避免增加利率D. 央⾏的帮助下仍然必要的,因为补贴不会使利率上升10. 如果央⾏拒绝⼤量增加政府⽀出,最可能的结果将是A.由于利率改变,国际收⽀的经常账户出现盈余B.由于利率改变,消费⽔平下降C.GDP组成发⽣变化D.上述所有Chapter 122. Which of the following items is a surplus item in the balance of payments for the United Sates?A. a U.S. car dealer buys 20 BMWs from Germany and sells them at a profit in the U.S.B. a U.S. citizen deposits funds in a bank in the BahamasC. a German firm pays to get a license for the use of American technologyD. Bill Gates buys himself a small island off the coast of Indonesia4. 如果美国商品的价格⽔平为P = 110,外国商品的价格⽔平为P f = 220,名义汇率为e=1.2,真正汇率为 2.46. The concept of relative purchasing power parity implies thatA. the real exchange rate adjusts slowly to its long-run average levelB. the domestic price level will change rapidly until the real exchange rate is equal to 1C. the relative demand for domestic goods will rise if the real exchange rate is below 1D. the long-run relative price level of domestic to foreign goods (P/P f) is equal to 17. Restrictive monetary policy in the U.S.A. lowers the value of the U.S. dollar relative to other currenciesB. increases the value of the U.S. dollar relative to other currenciesC. increases U.S. net exportsD. should not have any effect on the U.S. trade balance9. In a model with flexible exchange rates and perfect capital mobility, restrictive fiscal policy is likely to causeA. an appreciation of the domestic currencyB. a decrease in the current account surplusC. an increase in net exportsD. an inflow of funds10. A country that follows a beggar-thy-neighbor policyA. induces an exchange rate depreciation to increase domestic output via monetary policyB. uses fiscal policy to increase its competitiveness on world marketsC. imposes a tariff on imported goodsD. tries to benefit from an increase in world demand by selling domestic products at higher pricesChapter 52.The Keynesian AS-curve implies thatA) the economy is always at the full-employment level of outputB) the AS-curve is completely verticalC) wages and prices are completely flexibleD) a change in spending will affect the level of GDP but not the price level3 In the Keynesian AS-curve case, if the government cuts welfare payments, thenA) the price level will decrease, but the economy will remain at the full-employment level of outputB) the level of output will decrease but the price level will remain the sameC) the levels of output and prices will decreaseD) unemployment will increase, since wages and prices are completely flexible4.The slope of the AS-curve becomes steeperA) as wages and prices become more flexibleB) as wages become more rigidC) as the economy moves further away from full employmentD) as the government implements expansionary fiscal policy5.If the unemployment rate is assumed to be at its natural rate, thenA) inflation cannot existB) the unemployment rate is zeroC) the unemployment rate is positive but at a level that exists when GDP is at its potential levelD) all unemployment is cyclical in nature6.In the medium run, an increase in oil prices willA) increase the price level but reduce the level of outputB) lead to a decrease in aggregate demandC) lead to an increase in aggregate demandD) not affect the level of real output10.As potential GDP grows over timeA) the level of output is essentially determined by shifts in the vertical AS-curveB) the price level remains constantC) the AD-curve shifts to the right due to a change in the average price levelD) the level of actual output can only change if the AD-curve shifts accordinglyChapter 65.The coordination approach to the Phillips curve focuses on the fact thatA) fiscal and monetary policies often are uncoordinatedB) firms are reluctant to change wages and prices because they aren't sure what their competitors will doC) workers are well informed about changes in their nominal wages but not about changes in their real wagesD) anticipated changes in monetary policy have no significant effect on the unemployment rate7.Which of the following equations best describes Okun's law?A) (Y - Y*) = 0.5(u - u*)B) (Y - Y*)/ Y* = - 2(u - u*)C) (Y* - Y) = 2(u - u*)D) (Y* - Y)/Y = - 0.5(u - u*)9.Which of the following is the most likely result of an unanticipated increase in money supply?A) higher prices and output in the medium run but no change in output in the long runB) higher prices and lower real money balances in both the medium and the long runC) higher prices and employment in the medium run, but no change in output and prices in the long runD) higher prices and output in the medium and long runs10.If the government employs restrictive monetary policy in response to an adverse supply shock,A) the inflation rate and the natural rate of unemployment will both decreaseB) the rate of unemployment will increase sharplyC) unemployment will remain at its natural levelD) the shift in the AS-curve can be reversed almost immediatelyChapter 33.If we assume a Cobb-Douglas production function where the share of labor is 3/4 and the share of capital is 1/4, then the marginal product of capital can be calculated asA) 3Y/4KB) Y/4KC) 4Y/KD) Y/K5.Assume a Cobb-Douglas aggregate production function in which labor's share of income is 0.7 and capital's share of income is 0.3. At what rate will real output grow if labor grows at2.0%, the capital stock grows at 1.0%, and total factor productivity increases by 1.8%?A) 4.8%B) 3.5%C) 3.0%D) 1.8%6.In the neoclassical growth model, a decrease in the savings rateA) raises the growth rate of output per capitaB) lowers the growth rate of output per capitaC) raises the steady-state capital-labor ratioD) lowers the steady-state capital-labor ratio7.In the neoclassical growth model, a decrease in the rate of population growth willA) decrease the growth rate of outputB) decrease the level of output per capitaC) decrease the steady-state capital-labor ratioD) all of the above8.In the neoclassical growth model, a one-time increase in technology willA) increase the growth rate of outputB) shift the investment requirement line upC) increase the steady-state capital-labor ratioD) all of the aboveChapter 41.Constant returns to scale for capital alone implies thatA) as both capital inputs and labor inputs are doubled, output will more than doubleB) as both capital inputs and labor inputs are doubled, output will less than doubleC) as both capital inputs and labor inputs are doubled, output will doubleD) as capital inputs are doubled, output will less than double2.Paul Romer's notion of social returns to capital implies thatA) the contribution of any new knowledge will not just go to the producer of new knowledge but be shared by others as wellB) new capital investments have a bigger impact on growth if the owners of capital share their newfound wealth with the poorC) investment in real capital benefits society as a whole while investment in human capital only benefits those who invest in themselvesD) investment in real capital has a bigger impact on labor productivity than investment in human capital3.The distinction between private and social returns to capital is important sinceA) policy makers want to know how much the government can gain from capital investmentsB) capital investments cannot be undertaken profitably unless subsidized by the governmentC) capital investments often have important spillover effectsD) capital investment increases labor productivity4.Assume an endogenous growth model with labor augmenting technology and a production function of the form Y =F(K,AN), with A = 2(K/N) such that y = 2k. If the rate of population growth is n = 0.03, the rate of depreciation is d = 0.04, and the savings rate is s = 0.08, the growth rate of output per capita isA) 15%B) 9%C) 7%D) 1%5.Assume an endogenous growth model with labor augmenting technology and a production function of the form Y =F(K,AN), with A = 1.2(K/N) such that y = 1.2k. If the rate of population growth is n = 0.03, the rate of depreciation is d = 0.05, how large would the savings rate (s) have to be to achieve a per-capita growth rate of output of 4 percent?A) 12%B) 10%C) 8%D) 4%6.Assume an aggregate production function with a constant marginal product of capital and with capital as the only factor of production, such that Y = aK. If there is neither population growth nor depreciation of capital, the growth rate of per-capita output isA) Δy/y = saB) Δy/y = sa + (n - d)C) Δy/y = sa + (n + d)D) Δy/y = sa/(n + d)7.The idea that increased investment in research and development will enhance economic growth isA) the key to linking higher savings rates to higher equilibrium growth ratesB) totally unprovenC) a crucial element of conditional convergenceD) an important part of the neoclassical growth model8.Conditional convergence is predicted for two countries with the same population growth and access to the same technology. This means that they will eventuallyA) reach the same income per capita and the same economic growth rate even if they have different savings ratesB) reach a different income per capita but the same economic growth rate even if they have different savings ratesC) reach the same income per capita and different economic growth rates if they have different savings ratesD) reach different income per capita levels and different economic growth rates if they have different savings rates9.Endogenous growth theory predicts that countries will achieve higher economic growth rates if they manage toA) lower their population growthB) increase their savings ratesC) shield their industries from foreign competitionD) all of the above10.The four "Asian Tigers" achieved their economic growth between 1966 and 1990 mostly throughA) population controlB) protection of domestic industries from foreign competitionC) hard work and sacrificeD) a large degree of government interventionChapter 131.Keynes' theory of consumption behavior largely relied on the equation C = Co + cY. This equation implies that the value of the average propensity to consumeA) increases as the economy goes into a recessionB) increases as the economy goes into a boomC) remains constant whether the economy goes into a boom or a recessionD) is always lower than the value of the marginal propensity to consume2.Assume a worker at age 30 with no wealth and an expected average annual earnings of $50,000, who wants to retire at age 65 and expects to live until age 80. According to the life-cycle hypothesis what dollar amount does that person consume annually?A) $45,000B) $40,000C) $35,000D) $30,0003.If we divide consumption expenditures into the purchases of non-durable goods and the purchases of durable goods, we realize thatA) the life-cycle and permanent-income theories apply much more to the consumption of non-durable goods than durable goodsB) the consumption of non-durable goods is much more interest sensitive than the consumption of durable goodsC) the consumption of non-durable goods is more strongly affected by a surprise change in income than the consumption of durable goodsD) the consumption of durable goods this year is largely the same as the consumption of durable goods last year4.According to the permanent-income theory of consumptionA) the short-run multiplier is identical to the long-run multiplierB) the short-run multiplier is larger than the long-run multiplierC) the short-run mpc is larger than the long-run mpcD) the short-run mpc is smaller than the long-run mpc5.According to the permanent-income hypothesisA) increases in current income lead to large increases in current consumptionB) current consumption is not significantly affected by a temporary change in incomeC) the mpc out of transitory income is greater than the mpc out of permanent incomeD) increases in the interest rate will affect consumption negatively6.The random-walk theory of consumptionA) clearly contradicts the permanent-income theoryB) predicts that current consumption is most strongly affected by current incomeC) predicts that this year's consumption is most strongly affected by last year's consumptionD) does not support the notion that people have rational expectations7.The fact that consumption exhibits "excess smoothness" implies thatA) consumption responds too strongly to surprise changes in incomeB) current consumption can be predicted based on changes in current incomeC) changes in transitory income have no effect on current consumption or savingD) none of the above8.If we account for liquidity constraints,A) we can explain why a temporary tax increase may have an effect on current consumptionB) we have to discard the permanent-income hypothesisC) consumption becomes much more interest sensitiveD) consumption responds much less severely to surprise changes in income9.Household savings behavior tends to be fairly interest inelastic, which can be largely explained byA) a very large substitution effectB) the fact that the income effect dominates the substitution effectC) the fact that the substitution effect is largely offset by the income effectD) the fact that the consumption of durable goods tends to be very interest inelastic10.Which of the following is an objection to the Barro-Ricardo proposition?A) people believe that debt-financing merely postpones taxationB) people who benefit from a tax cut now are often not the same people who pay higher taxes laterC) a tax cut may ease a person's liquidity constraints, inducing the person to consume moreD) most people can borrow funds when necessary and therefore always consume according to their permanent income Chapter 141Which of the following will NOT affect the productive capacity of a country?A) more people getting a higher educationB) more people investing in government bondsC) the government improving the infrastructure such as bridges and highwaysD) firms replacing old PCs with newer, more efficient ones2In absence of taxation, the rental cost of capital can be defined asA) rc = i + πe - dB) rc = i - πe - dC) rc = i - πe + dD) rc = i + πe + d3If we ignore taxation and know that the rental cost of capital is 12%, the expected rate of inflation is 4%, and the nominal interest rate is 9%, we can conclude that the rate of depreciation must beA) d = 1%B) d = 7%C) d = 17%D) d = 25%4If the rental cost of capital is above the marginal product of capital, then a firm shouldA) increase its investment spendingB) decrease its investment spendingC) not replace some of the machines that have broken down in the production processD) undertake primarily replacement investments5Assume a Cobb-Douglas production function of the form Y = AK0.2N0.8. If the rental cost of capital is rc = 5%, the desired capital stock of a cost-minimizing firm should be equal toA) K* = 2YB) K* = 4YC) K* = 5YD) K* = 8Y6Assume the market interest rate is 10% and is not expected to change over the next three years. If an investment project has net returns of $2,420 after one year, $3,630 after the second year, and $3,993 after the third year, what is its net present discounted value?A) $10,043B) $9,130C) $9,020D) $8,2007The most likely source of funding for a U.S. firm wishing to finance a new investment project isA) a credit line with a bankB) retained earningsC) selling bondsD) issuing equity (stocks)8According to the accelerator model,A) a change in investment is proportional to the level of outputB) the level of investment spending is proportional to the level of outputC) the level of investment spending is proportional to the change in outputD) the level of investment spending is mainly affected by interest rate changes9Expansionary monetary policy has an effect on the housing market since itA) decreases the price of all assets, including housing pricesB) lowers real interest rates in the long run, so people will postpone buying homesC) lowers nominal interest rates, so banks find mortgage lending less profitableD) lowers nominal interest rates, so more homebuyers are able to qualify for mortgages10An unanticipated decrease in the level of inventories may occurA) in the midst of a boom, as firms prepare for the upcoming recessionB) in a boom when increased sales cannot be met by increases in productionC) in a recession when firms expect lower profits and try to keep their costs lowD) at the beginning of a recession as firms slash their prices to induce more salesChapter 151.As credit and debit cards are more widely used, we should expect thatA) more money balances will be held in M1B) more money balances will be held in M2C) less money balances will be held in M2D) less money balances will be held in M1, but those held in M2 will remain unchanged 2Which of the following would lead to increased money balances in M1?A) more purchases made on the internetB) more credit card purchasesC) lower inflationary expectationsD) all of the above3A financial asset is considered less liquid ifA) it has a longer maturityB) it is issued by the government rather than a large corporation such as MicrosoftC) it earns a lower yieldD) none of the above4The Baumol-Tobin square-root formula for money demand applies primarily toA) the transactions motive of holding moneyB) the precautionary motive of holding moneyC) the speculative motive of holding moneyD) the store-of-value motive of holding money5According to the Baumol-Tobin square-root formula, the amount of money balances held for transaction willA) increase as interest rates increaseB) decrease as the cost of money transactions increasesC) increase less than proportionately to increases in incomeD) all of the above6The speculative demand for moneyA) will always increase proportionately to the precautionary demand for moneyB) will always increase proportionately to the transactions demand for moneyC) is affected by changes in bond yields but not equity yieldsD) cannot be easily separated from money demand for transaction or precaution7If the expected growth rate in real GDP for next year is 2.5%, we can anticipate that the demand for M1 money holdings willA) also increase by 2.5%B) increase by more than 2.5%C) increase by less than 2.5%D) remain constant8The income velocity of money is defined asA) real money supply divided by real GDPB) nominal money supply divided by nominal GDPC) nominal GDP divided by nominal money supplyD) national income divided by the currency outstanding9If the government increases the level of government purchases, we can expect thatA) interest rates and the income velocity of money will both increaseB) interest rates and the income velocity of money will both decreaseC) interest rates will increase but the income velocity of money will decreaseD) interest rates will increase but the income velocity of money will remain the same 10According to the quantity theory of money, in the long runA) the behavior of velocity is hard to predictB) a change in money supply will be followed by a proportional change in the price levelC) an increase in nominal money supply will result in a proportional decrease in velocityD) an increase in nominal money supply will result in a proportional increase in velocity。
多恩布什《宏观经济学》第七版习题答案(英文)--02
Solutions to Problems in the T extbook:Conceptual Problems:1. Government transfer payments (TR) do not arise out of any production activity and arethus not counted in the value of GDP. If the government hired the people who currently receive transfer payments, then their wages would be counted as part of government purchases (G), which is counted in GDP. Therefore GDP would rise.2.a. If the firm buys a car for an executive's use, the purchase counts as investment (I). But ifthe firm pays the executive a higher salary and she then buys a car, the purchase is counted as consumption (C).2.b. The services that a homemaker provides are not counted in GDP (regardless of theirvalue). However, if an individual officially hires his or her spouse to perform household duties at a certain wage rate, then the wages earned will be counted in GDP and GDP will increase.2.c. If you buy a German car, consumption (C) will increase but net exports (NX = X - Q) willdecrease. Overall GDP will increase by the value added at the foreign car dealership, since the import price is likely to be less than the sales price. If you buy an American car, consumption and thus GDP will increase. (Note: If the car you buy comes out of the car dealer's inventory, then the increase in C will be partially offset be a decline in I, and GDP will again only increase by the value added.)3. GDP is the market value of all final goods and services currently produced within thecountry. (The U.S. GDP includes the value of the Hondas produced by a Japanese-owned assembly plant that is located in the U.S., but it does not include the value of Nike shoes that are produced by an American-owned shoe factory located in Malaysia.) GNP is the market value of all final goods and services currently produced using assets owned by domestic residents. (Here the value of the Hondas produced by a Japanese-owned Honda plant is not counted but the value of the Nikes by the American-owned shoe plant is.)Neither is necessarily a better measure of the output of a nation. The actual value of the GDP and GNP for the U.S. is fairly close.4. The NDP (net domestic product) is defined as GDP minus depreciation. Depreciationmeasures the value of the capital that wears out during the production process and has to be replaced. Therefore NDP comes closer to measuring the net amount of goods produced in this country. If this is what you want to measure, then NDP should be used.5. Increases in real GDP do not necessarily mean increases in welfare. For example, if thepopulation of a country increases by more than real GDP, then the population of the country is on average worse off. Also some increases in output come from welfare reducing events. For example, increased pollution may cause more lung cancer, and the treatment of the lung cancer will contribute to GDP. Similarly, an increase in crime may lead to overtime work for police officers, whose increased salary will increase GDP. But the welfare of the people in the country may not have increased in either case. On the other hand, GDP does not always accurately measure quality improvements in goods or services (faster computers or improved health care) that improve people's welfare.6. The CPI (consumer price index) and the PPI (producer price index) are both measuredby looking at a certain market basket. The CPI's basket contains mostly finished goods and services that consumers tend to buy regularly in their daily lives. The PPI’s basket contains raw materials and semi-finished goods, that is, it measures costs to the producer of a product and its first user. The CPI is a concurrent economic indicator, whereas the PPI is a leading economic indicator.7. The GDP-deflator is a price index that covers the average price increase of all final goodsand services currently produced within an economy. It is defined as the ratio of current nominal GDP to current real GDP. Nominal GDP is measured in current dollars, while real GDP is measured in so-called base-year dollars. Even though early estimates of the GDP-deflator tend to be unreliable, the GDP-deflator can be a more useful price index than the CPI or PPI (both of which are fixed market baskets). This is true for two reasons: first it measures a much wider cross-section of goods and services; second, a fixed market basket cannot account for people substituting away from goods whose relative prices have changed, while the GDP-deflator, which includes all goods and services produced within the country, can.8. If nominal GDP has suddenly doubled, it is most likely due to an increase in the averageprice level. Therefore, the first thing you would want to check is by how much the GDP-deflator has changed, to calculate by how much real output (GDP) has changed. If nominal GDP and the GDP-deflator have both doubled, then real GDP should be the same.9. Assume the loan you made yields you an annual nominal return of 7%. If the rate ofinflation is 4%, then your rate of return in real terms is only 3%. If, on the other hand, if inflation rate is 10%, then you will actually get a negative real rate of return, that is, you will lose 3% of your purchasing power. One way to protect yourself against such a loss of purchasing power is to adjust the interest rate for inflation, that is, to index the loan. In other words, you can require that, in addition to the specified interest rate of the loan of,let’s say, 3%, the borrower also has to pay an inflation premium equal to the percentage change in the CPI. In this case, a real rate of return of 3% would be guaranteed.T echnical Problems:1. The text calculates the change in real GDP in 1992 prices in the following way:[RGDP01 - RGDP92]/RGDP92 = [3.50 - 1.50]/1.50 = 1.33 = 133%.To calculate the change in real GDP in 2001 prices, we first have to calculate the GDP of 1992 in 2001 prices. Thus we take the quantities consumed in 1992 and multiply them by the prices of 2001, as follows:Beer 1 at $2.00 = $2.00Skittles 1 at $0.75 = $0.75_______________________________Total$2.75The change in real GDP can now be calculated as[6.25 - 2.75]/2.75 = 1.27 = 127%.We can see that the growth rate of real GDP calculated this way is roughly the same as the growth rate calculated above.2.a. The relationship between private domestic saving, investment, the budget deficit and netexports is shown by the following identity:S - I ≡ (G + TR - TA) + NX.Therefore, if we assume that transfer payments (TR) remain constant, then an increase in taxes (TA) has to be offset either by an increase in government purchases (G), a decrease in net exports (NX), or a decrease in the difference between saving (S) and investment (I).2.b. From the equation YD ≡ C + S it follows that an increase in disposable income (YD) willbe reflected in an increase in consumption (C), saving (S), or both.2.c. From the equation YD ≡ C + S it follows that when either consumption (C) or saving (S)increases, disposable income (YD) must increase as well.3.a. Since depreciation D = I g - I n = 800 - 200 = 600 ==>NDP = GDP - D = 6,000 - 600 = 5,4003.b. From GDP = C + I + G + NX ==> NX = GDP - C - I - G ==>NX = 6,000 - 4,000 - 800 - 1,100 = 100.3.c. BS = TA - G - TR ==> (TA - TR) = BS + G ==> (TA - TR) = 30 + 1,100 = 1,1303.d. YD = Y - (TA - TR) = 5,400 - 1,130 = 4,2703.e. S = YD - C = 4,270 - 4,000 = 2704.a. S = YD - C = 5,100 - 3,800 = 1,3004.b. From S - I = (G + TR - TA) + NX ==> I = S - (G + TR - TA) - NX = 1,300 - 200 - (-100)= 1,200.4.c. From Y = C + I + G + NX ==> G = Y - C - I - NX ==>G = 6,000 - 3,800 - 1,200 - (-100) = 1,100.Also: YD = Y - TA + TR ==> T A - TR = Y - YD = 6,000 - 5,100 ==> TA - TR = 900From BS = T A - TR - G ==> G = (TA - TR) - BS = 900 - (-200) ==> G = 1,1005. According to Equation (2) in the text, the value of total output (in billions of dollars) canbe calculated as: Y = labor payments + capital payments + profits = $6 + $2 + $0 = $86.a. Since nominal GDP is defined as the market value of all final goods and servicescurrently produced in this country, we can only measure the value of the final product (bread), and therefore we get $2 million (since 1 million loaves are sold at $2 each).6.b. An alternative way of measuring total GDP would be to calculate all the value added ateach step of production. The total value of the ingredients used by the bakeries can be calculated as:1,200,000 pounds of flour ($1 per pound) = 1,200,000100,000 pounds of yeast ($1 per pound) = 100,000100,000 pounds of sugar ($1 per pound) = 100,000100,000 pounds of salt ($1 per pound) = 100,000__________________________________________________________ = 1,500,000Since $2,000,000 worth of bread is sold, the total value added at the bakeries is $500,000.7. If the CPI increases from 2.1 to 2.3, the rate of inflation can be calculated in thefollowing way:rate of inflation = (2.3 - 2.1)/2.1 = 0.095 = 9.5%The CPI often overstates inflation, since it is calculated by using a fixed market basket of goods and services. But the fixed weights in the CPI's market basket cannot capture the tendency of consumers to substitute away from goods whose relative prices have increased. Therefore, the CPI will overstate the increase in consumers' expenditures.8.The real interest rate (r) is defined as the nominal interest rate (i) minus the rate ofinflation (π). Therefore the nominal interest rate is the real interest rate plus the rate of inflation, ori = r + π = 3% + 4% = 7%.。
16宏观经济学英文版(多恩布什)课后习题答案全解
CHAPTER 16THE FED, MONEY, AND CREDITSolutions to the Problems in the Textbook:Conceptual Problems:1. The three tools the Fed has to conduct monetary policy are open market operations, discount ratechanges, and reserve requirement changes. If the Fed wants to increase the money supply, it has the following options: first, the Fed can buy government bonds from the public (mostly banks), thereby increasing bank reserves. These open market purchases will induce banks to extend their loans, which will create more money. Second, it can lower the discount rate, so it becomes less costly for banks to borrow reserves from the Fed. This also will induce banks to create more money by extending more loans. Finally, the Fed can lower the required-reserve ratio, which again will allow banks to lend more.2. The currency-deposit ratio is the ratio of currency outstanding to bank deposits. The Fed cannotdirectly influence this ratio, since it is determined by the behavior of the public and influenced by the convenience of obtaining cash and by seasonal patterns (increased Christmas shopping, for example).However, by changing either bank regulations (that would affect the ease of obtaining cash) or interest rates (that would change the opportunity cost of holding cash), the Fed may indirectly affect how much currency the public is willing to hold.3.a. 3.a.ii2i2i1 i10 0Y2 Y1 Y Y1 Y2 YIf most disturbances come from the money sector (a shift in money demand), interest rate targets work better than money targets. In the IS-LM diagram below we can see that as money demand increases due to changing expectations, the LM-curve will shift to the left and the interest rate will increase. By increasing money supply and shifting the LM-curve back to the right, the central bank can get the economy back to the original equilibrium.3.b. If most disturbances come from the expenditure sector, the central bank is better off targeting moneysupply. If spending increases, the IS-curve shifts to the right and the interest rate increases. If the central bank tried to get the interest rate back to its original level by increasing money supply, the disturbance would intensify, since the LM-curve would also shift to the right. Thus, the central bank should keep money supply (and thus the LM-curve) stable to keep the disturbance at a minimum.4.a. A bank run occurs when depositors, worried about the safety of their assets, rush to withdraw theirdeposits.4.b. If a bank is in trouble because it has made some bad investment decisions, people may expect it tofail. Thus they may want to withdraw their deposits before it is too late. Since other depositors are1likely to behave in the same way, a run on the bank can be anticipated. Even a fairly financially sound bank may not be able to withstand a run, since most assets are tied up in loans. Almost all U.S. banks are FDIC insured and therefore a run on a bank is very unlikely. With FDIC insurance, depositors know that they can get at least their principal back from the government should a bank fail, and therefore they do not panic easily.4.c. During the Great Depression, a large-scale run on banks lead to liquidity problems and bank failures.This decreased the lending power of the whole banking system. In other words, depositors lost their confidence in banks and withdraw their deposits. This increased the currency-deposit ratio, leading toa decrease in the money multiplier and a contraction in money supply.4.d. The existence of the FDIC increases the public's confidence in the banking system, so a run on banksis highly unlikely. Therefore the currency-deposit ratio is low and the value of the money multiplier is high. The money multiplier is also more stable since the public does not withdraw deposits any time a bank failure occurs.5.a. There are basically two reasons why the Fed does not adhere more closely to its monetary growthtargets in the short run. The first is technical: due to the variability of the money multiplier and the lag in collecting data on money supply figures, the Fed is not always able to achieve its monetary growth target. The second reason is that the Fed, in the short run, uses interest rate targets concurrently with monetary growth targets, and it is impossible to succeed at both at the same time. Therefore, as the Fed responds to changes in the economy, it may move away at least temporarily from its monetary growth target. The Fed's desire to have some short-run flexibility while still maintaining long-run credibility, may cause a temporary deviation from the announced monetary growth target.5.b. The targeting of nominal interest rates can be self-defeating, especially in times of high inflation. If(nominal) interest rates increase, the Fed has to increase money supply to reduce interest rates to their original level. However, expansionary monetary policy will lead to more inflation and this will ultimately result in higher nominal interest rates. The so-called Fisher-equation states that the nominal interest rate (i n) is equal to the real interest rate (i r) plus the rate of inflation (π), that is,i n = i r + π.In the long run, the real interest rate will not be affected by expansionary monetary policy, but the nominal interest rate will be higher due to increased inflation. Another attempt to further reduce the nominal interest rate by expanding money supply even more will aggravate inflation even more and ultimately not succeed in bringing interest rates down.6.a. Nominal GDP is an ultimate target of monetary policy.6.b. The discount rate is an instrument of monetary policy.6.c. The monetary base is an immediate target of monetary policy.6.d. M1 is an intermediate target of monetary policy.6.e. The Treasury bill rate is an intermediate target of monetary policy.6.f. The unemployment rate is an ultimate target of monetary policy.7. When banks ration credit, interest rates are no longer a good indication of existing market conditions.Credit is rationed when lending institutions limit the amount that their customers can borrow based on concerns that such borrowing may not be financially prudent. In this situation, the Fed should not use interest rate targets as a guide for its monetary policy, since interest rates no longer reflect true market conditions.8. The Fed has much more control over intermediate targets (money supply or interest rates) than it doesover ultimate targets (GDP, unemployment, or inflation). Changes in these intermediate targets do not have an immediate effect on the ultimate targets and therefore the Fed can easily reverse or re-enforce its policy measure. Because of the long lags associated with monetary policy, the Fed uses these2intermediate targets to get feedback on the effects of a policy change and the likeliness that a policy measure will achieve its ultimate goal. However, concentrating solely on intermediate targets does not guarantee that the ultimate objectives will be achieved.9. From the quantity theory of money equation MV = PY, we get%∆M + %∆V = %∆P + %∆Y ==> %∆P = %∆M - %∆Y + %∆V.If real GDP (Y) is assumed to grow at a rate of 3.5%, the Fed has to let money supply (M) grow at a rate of 3.5% to keep prices (P) stable, assuming that velocity (V) remains stable. The Fed can control nominal GDP through changes in nominal money supply only as long as the behavior of money demand (and thus velocity) is relatively predictable. The long-run GDP growth rate has been around2.25%, far below the3.5% mentioned here, and expansionary monetary policy will not achieve such ahigh growth rate. But there is a very close relationship between money supply changes and price changes in the long run, while real GDP growth is primarily influenced by other factors. If the Fed overestimates the rate at which potential GDP grows, then it is likely to stimulate the economy too much and induce high inflation. Therefore, nominal GDP targeting rather than real GDP targeting may be a better approach, since the former creates a policy tradeoff between unemployment and inflation. In other words, we will get less growth but also less inflation if potential GDP growth is overestimated.Technical Problems:1. Assume the Fed sells Treasury bills valued at $10 million to a bank.Fed Balance Sheet: Assets LiabilitiesGovt. securities - $10 Currency 0Other assets 0 Bank deposits - $10 Bank Balance Sheet: Assets LiabilitiesDeposits at the Fed - $10 Deposits 0Govt. securities + $10Other assets 0The bank has now lost $10 million in reserves (deposits at the Fed). If required reserves are no longer sufficient, then the bank will have to acquire new reserves.If a bank depositor buys the Treasury bills, then the balance sheet will be:Bank Balance Sheet: Assets LiabilitiesReserves - $10 Deposits - $10Other assets 0Again, the bank may have to make up for the loss of reserves.2. Assume the Fed buys $10 million worth of gold and then decides to sterilize the effect of thispurchase on the monetary base through open market operations.Fed Balance Sheet: Assets LiabilitiesGold + $10 Currency 0Other assets 0 Member bank deposit + $10 The purchase of gold increased the monetary base (bank reserves) by $10 million.Fed Balance SheetAfter Sterilization: Assets LiabilitiesGold + $10 Bank deposits (+10 -10) = $0Govt. securities - $103The sale of government securities to banks again decreased the monetary base (bank reserves) by $10 million, so there is no overall change in the monetary base.3.a. If the reserve-deposit ratio is 100%, then banks cannot create any loans and the money multiplier isequal to 1. This means that the Fed has total control over the money supply, since it has control over bank reserves. However, this would significantly change the banking industry, since banks no longer would be able to extend loans.3.b. Since banks would not be able to issue any loans, the assets side would contain only reserves.3.c. Banking could still remain profitable as long as banks were able to generate service charges to covertheir operating costs.4.In deciding whether monetary base targeting or interest rate targeting is better for the Fed in itsconduct of monetary policy, it would be good to know whether the goods sector or the money sector is more prone to disturbances. If most disturbances occur in the goods sector (assume the IS-curve shifts to the right), then monetary base targeting is better, since interest rate targets would force the Fed to aggravate the disturbance. Under interest rate targeting, the Fed would be forced to change money supply (shifting the LM-curve to the right) and aggregate demand would be changed even more. If most disturbances occur in the money sector (assume the LM-curve shifts to the left), then interest rate targeting is better, since the Fed can easily offset the disturbance. Under interest rate targeting the Fed could change money supply (shifting the LM-curve to the right again) without affecting aggregate demand.ii2i2i1 i1Y2 Y1 Y Y1 Y2 YAdditional Problems:1. How does an increase in the currency-deposit ratio affect the money multiplier? What is theeffect of an increase in the reserve-deposit ratio?The money multiplier is defined as mm = (1 + cu)/(cu + re), wherecu = CU/D = currency-deposit ratio, andre = R/D = reserve-deposit ratio.An increase in the currency-deposit ratio means that people hold more currency and banks have fewer funds to create deposits. Therefore the money multiplier decreases. An increase in the reserve-deposit ratio means that banks now hold more reserves, so fewer deposits can be created. Again, the money multiplier decreases.42. Assume that an increasing number of department and grocery stores accept credit and debitcards and more consumers use these cards to do their shopping. How will the money multiplier and money supply be affected?If more consumers make purchases using credit or debit cards rather than cash, then less currency is held and the currency-deposit ratio will be lower. This implies a larger money multiplier and, given a fixed stock of high-powered money, an increase in money supply.3. "The introduction of the FDIC after the Great Depression not only calmed the worries of thepublic but also made monetary policy easier for the Fed." Comment on this statement.The introduction of the FDIC lowered the public's fear of new bank failures. Consumer confidence in the banking system increased and people held less currency. Banks also were able to reduce their excess reserves, since they no longer feared a widespread bank run. The currency-deposit and the reserve-deposit ratios both declined, and the size of the money multiplier increased. In addition, the money multiplier became more stable, since consumers became less likely to panic after a bank failure occurred. The larger and the more stable the money multiplier, the easier it is for the Fed to control money supply by changing the monetary base through open market operations.4. Assume money supply (M) is $1,200 billion, total bank deposits (D) are $800 billion and therequired reserve-deposit ratio is 10%. What would the Fed have to do to lower money supply by 5%? Explain your answer.We know that M = CU + D ==> CU = M - D = 1,200 - 800 = 400.If we assume that banks do not hold excess reserves, thenR = (0.1)D = (0.1)800 = 80 and H = CU + R = 400 + 80 = 480.Thus the money multiplier is M/H = mm = 1,200/480 = 2.5.If the Fed wants to reduce money supply by 5% or $60 billion, it has to reduce high-powered money (H) by $24 billion, by selling $24 billion worth of Treasury bills. In other words,∆M = mm(∆H) == > - 60 = 2.5(∆H) ==> (∆H) = - 60/2.5 = - 245. Assume the currency-deposit ratio is 30%, the required reserve-deposit ratio is 8% and theexcess reserve-deposit ratio is 2%. How much would money supply change if the Fed made open market sales valued at $20 million?The money multiplier is defined as: M/H = mm = (1 + cu)/(cu + re).In this example the size of the money multiplier is equal tomm = (1 + 0.3)/(0.3 + 0.08 + 0.02) = (1.3)/(0.4) = 3.25.An open market sale valued at $20 million would decrease high-powered money (H) by $20 million. Therefore, money supply (M) would decrease by $65 million, since∆M = mm(∆H) = (3.25)(-20) = - 65.6. Assume bank deposits are $3,200 billion, the required reserve-deposit ratio is 10%, andcurrency outstanding is $400 billion. What should the Fed do to decrease money supply by $100 million?Ms = Cu + D = 400 + 3,200 = 3,600 and H = Cu + R = Cu + (0.1)D = 400 + 320 = 720==> money multiplier = Ms/H = mm = 3,600/720 = 5==> ∆Ms = mm(∆H) ==> - 100 = 5(∆H) ==> ∆H = - 20If the Fed wants to decrease money supply by $100 million, bank reserves have to be decreased by $20 million through the open market sale of government securities. (Note: The assumption was that excess reserves are zero, which may not be true.)7. True or false? Why?5"An open market sale raises the monetary base and therefore money supply."False. An open market sale occurs when the Fed sells government bonds to the private sector, primarily banks, in return for currency. Reserves held in the form of deposits at the Fed decrease, and therefore the monetary base (the stock of high-powered money) decreases as does money supply, since banks cannot loan out as much as previously.8. What problems would arise if the Fed tried to conduct open market operations via the stockmarket?Theoretically, the Fed could change high-powered money and thus the supply of money by buying and selling stocks. The problem, however, would be how to decide which stocks to buy and sell, since the Fed's actions would affect the values of the stocks being bought or sold.9. "Large open market sales may have a negative impact on the demand for money, the budgetsurplus, the income velocity of money, and consumption." Comment on this statement.Open market sales decrease bank reserves and therefore money supply. This increases interest rates, leading to a lower level of investment and income. Since income tax revenues decrease in a recession, the budget surplus will also decrease. Since interest rates are higher, the interest payments on the national debt will increase. A lower level of income means a lower level of consumption. The income velocity of money generally declines in a recession. However, the decline in money occurs before the decline in income. Thus we first see an increase in velocity in the short run, followed by a decrease.10. Which is the most useful tool for the Fed to conduct its monetary policy? In your answerdiscuss the advantages and disadvantages of each of the tools that the Fed has at its disposal. The Fed has three basic tools to conduct monetary policy are open market operations, discount rate changes, and reserve requirement changes.Open market operations are used most often by the Fed since it can be undertaken every business day, can be undertaken to a large or small degree, and can be easily reversed. Bank reserves are immediately affected to a desired degree with the initiative lying solely with the Fed.The discount rate can be used as a signal for a change in monetary policy, but often a change in the discount rate simply reflects an adjustment to existing money market conditions. The disadvantage of using the discount rate is that it is up to banks to change the level of bank reserves. Bank reserves only change when banks borrow more or less from the Fed. Since this behavior cannot be anticipated, bank reserve changes cannot be accurately anticipated.Reserve requirement changes are used only rarely, since this is an extremely blunt tool. A reserve requirement change will affect the money multiplier and have a huge effect on money supply. Generally banks are given ample time to adjust to changes.11. Comment on the following statement:"Changes in the discount rate are always a sign that the Fed has changed its monetary policy." The discount rate is the rate at which banks can borrow from the Fed. The federal funds rate is the rate at which banks can borrow from each other. Banks generally prefer to borrow at the lowest rate. They do not like to borrow too often or too much from the Fed, however, since the Fed may then question their way of doing business. But if the demand for bank reserves increases and the difference between the federal funds rate and the discount rate gets too large, banks have an incentive to borrow from the Fed more often than usual. In this case total bank reserves will increase more than the Fed would like. As a result, the Fed may adjust the discount rate to bring it more in line with the federal funds rate. Therefore, while an increase in the discount rate may signal a shift in the Fed's policy, it may also simply reflect the Fed's response to a change in money market conditions.612. In 1991-92, the Fed repeatedly lowered the discount rate, but failed to stimulate the economy.Explain this fact. Subsequently, the Fed lowered the reserve requirements for banks. In your opinion, what was the Fed's objective in doing this, and was the objective achieved?Lowering the discount rate is not always successful in increasing money supply (and thus stimulating the economy), since it requires that banks take the initiative to change bank reserves. In 1991-92, the U.S. was in a recession and negative business expectations persisted. Many banks needed to recover from loan losses they had incurred and did not want to extend credit even though they were encouraged to do so by the Fed.The Fed finally lowered the reserve requirements for banks in a further effort to stimulate the economy but also to increase the profitability of banks. Banks do not earn interest on the reserves they hold, so a decrease in reserve requirements allowed them to increase their earnings and reduce their portfolio risk by buying Treasury-bills. While the economy was not immediately stimulated by new loans, at least the profitability of banks increased, creating more stability within the banking system.13. "Open market sales are more effective than increasing the discount rate in changing moneysupply." Comment. In your answer explain the short-run effects of restrictive monetary policy on velocity, the budget surplus, and national saving.With open market operations, the Fed has the initiative and bank reserves are immediately affected. Open market operations can be undertaken to a small or large extent on every business day, the Fed can determine the level of impact on bank reserves, and the Fed's actions can be easily reversed. Discount rate changes affect banks' cost of borrowing from the Fed, but leave the initiative to react to the banks. Thus, the Fed cannot easily predict the exact effect on bank reserves. For example, in 1991 the Fed changed the discount rate 15 times but banks did not borrow more from the Fed or increase their lending due to unfavorable economic conditions. If the Fed restricts money supply, interest rates will increase, leading to a decrease in economic activity. Initially, the income velocity (V = PY/M) will increase due to the lower money supply (M), but it will take time to affect income. But as national income (Y) decreases, income velocity will decline. Other results will include a decrease in the budget surplus (due to lower tax revenues) and national saving (due to lower income and a lower government surplus).14. Assume the Fed lowered the discount rate. How would personal saving, the budget surplus andaggregate money demand be affected?A lower discount rate is intended to encourage banks to borrow more from the Fed. It is not always clear that banks will respond as expected, but if they do, bank reserves will increase and so will money supply, as banks increase their lending activity. This will lower interest rates, leading to an increase in investment and national income. Personal saving will increase with a higher income level. Similarly, tax revenues will go up, increasing the budget surplus. Lower interest rates and higher income will increase money demand. (We also can see this from the fact that money supply has increased. Since the money sector has to move into a new equilibrium, money demand has to go up if money supply is increased.)15. Should you expect the federal funds rate to be above the discount rate or vice versa? Explain. The Fed is the lender of last resort and banks can always borrow from the Fed if the need arises. When banks borrow from the Fed, they are charged a rate called the discount rate. But banks also have the option to borrow from each other at the federal funds rate. Banks generally prefer to borrow at the lowest rate possible. However, they do not like to borrow too heavily from the Fed, since the Fed is a regulator of banks. Banks fear that their behavior will be questioned if the Fed takes notice and thus prefer to borrow from each other. In doing so, they drive the federal funds rate above the discount rate.716. "Reserve requirements act as an unfair tax on banks." Comment on this statement.Banks are forced to hold their reserves either as vault cash or as deposits at the Fed earning no interest in either case. Since other financial institutions have no such reserve requirement, it could be argued that this unfairly taxes banks. On the other hand, reserves guarantee a certain amount of liquidity for the banking system, which may be necessary, should there be a run on banks. The reserves held as deposits at the Fed also serve to facilitate the check clearing process. For these reasons, the tax can be viewed as necessary and therefore less "unfair."17. Does the Fed have control over the federal funds rate and over bank reserves? If so, can the Fedcontrol both simultaneously?The Fed has indirect control over the federal funds rate, since it has control over the supply of total bank reserves in the banking system through open market operations. However, the Fed cannot control the demand for bank reserves. If the demand for bank reserves increases, the federal funds rate will rise. If the Fed chooses to peg the federal funds rate, it has to create additional bank reserves via open market purchases. On the other hand, if the Fed chooses to control the level of bank reserves, it has to let the federal funds rate fluctuate. Therefore, the Fed cannot control the federal funds rate and the level of bank reserves simultaneously.18. "By lowering the reserve requirements for banks, the Fed reduces the budget deficit, nationalsaving, and the income velocity of money." Comment on this statement.If the Fed lowers the reserve requirement, banks have more money to lend out and can thus increase their earnings by making more loans or buying T-bills. If banks extend their loans, then money supply will increase and interest rates will decrease, stimulating investment and national income. Saving will increase with a higher level of income. Similarly, tax revenues will go up, reducing the budget deficit. Interest payments on the national debt will also decrease with lower interest rates, which will also help to lower the deficit. Velocity will initially decrease, since money supply will increase before income. But as income increases, then velocity will increase again. Ultimately, velocity may not change by much, since the income elasticity of money demand is close to one in the long run.19. "Restrictive monetary policy over a long time period will lead to lower interest rates."Comment on this statement.Long-run effects of monetary policy are different from short-run effects. Restrictive monetary policy leads to higher interest rates in the short run due to less liquidity (liquidity effect). But higher interest rates will reduce aggregated demand, which reduces prices and national income. Thus the level of interest rates will start to decline again (price-income effect). Lower prices will eventually lead to lower inflationary expectations and thus lower nominal interest rates (price-anticipation effect). In the end, real interest rates (i r) will return to their original level and nominal interest rates (i n) will be lower, since the inflation rate (π) is lower. This is shown in the so-called Fisher equation: i n = i r + π.20. "The elimination of required reserves on bank deposits would decrease the Fed's control overmoney supply. But if money supply increased uncontrollably, then high rates of inflation would result." Comment on the following statement.The Fed has a number of policy instruments at its disposal to control the level of bank reserves (and thus money supply). The required-reserve ratio is only one such instrument. The Fed can always influence bank reserves through the use of open market operations. Even if reserve requirements are abolished, the money multiplier will always have a finite value, since banks will always hold some (excess) reserves to meet their daily cash needs and emergency needs. If the reserve requirement were eliminated, the money multiplier would become larger, since banks would not choose to voluntarily hold as many reserves as the Fed required. However, large-scale open market operations would still enable the Fed to exercise great influence over bank reserves and therefore money supply.8。
多恩布什宏观经济学第十版课后习题复习资料08
•CHAPTER 8Solutions to the Problems in the Textbook:Conceptual Problems:1. The first question you should ask yourself as a policy maker is whether a disturbance is transitory orpersistent. You should then ask yourself how long it would take to put a suggested policy measure into effect and how long it will take for the policy to have the desired effect on the economy. In addition, you need to know how reliable the estimates of your advisors are about the effects of the policy. If a disturbance is small and probably transitory, you may be best advised to do nothing, because any measure you take is likely to have its effect after the economy has recovered. Therefore your action might only further aggravate the problem.2.a. The inside lag is the time it takes after an economic disturbance has occurred to recognize andimplement a policy action that will address the disturbance.2.b. The inside lag is divided into three parts. First, there is the recognition lag, that is, the time it takes forpolicy makers to realize that a disturbance has occurred and that a policy response is warranted.Second, there is the decision lag, that is, the time it takes to decide on the most desirable policy response after a disturbance is recognized. Finally, there is the action lag, that is, the time it takes to actually implement the policy measure.2.c. Inside lags are shorter for monetary policy than for fiscal policy since the FOMC meets on a regularbasis to discuss and implement monetary policy. Fiscal policy, on the other hand, has to be initiated and passed by both houses of the U.S. Congress and this can be a lengthy process. The exceptions are the so-called automatic stabilizers; however, they only work well for small and transitory disturbances2.d Automatic stabilizers have no inside lag; they are endogenous and function without specificgovernment intervention. Examples are the income tax system, the welfare system, unemployment insurance, and the Social Security system. They all reduce the amount by which output changes in response to an economic disturbance.3.a. The outside lag is the time it takes for a policy action, once implemented, to have its full effect on theeconomy.3.b. Generally, the outside lag is a distributed lag with a small immediate effect and a larger overall effectover a longer time period. The effect is spread over time, since aggregate demand responds to any1 / 1policy change only slowly and with a lag.3.c. Outside lags are longer for monetary policy since monetary policy actions affect short-term interestrates most directly, while aggregate demand depends heavily on lagged values of income, interest rates, and other economic variables. A change in government spending, however, immediately affects aggregate demand.4. Fiscal policy has smaller outside lags, but significant inside lags. Monetary policy, on the other handhas smaller inside lags and longer outside lags. Therefore large open market operations should be undertaken to get an immediate effect, but they should be partially reversed over time to avoid a large long-run effect. If the shock is sufficiently transitory and small, policy makers may be best advised not to undertake any policy change at all.5.a. An econometric model is a statistical description of all or part of the economy. It consists of a set ofequations that are based on past economic behavior.5.b. Econometric models are generally used to forecast the behavior of the economy and the effects ofalternative policy measures.5.c. There is considerable uncertainty about how well econometric models actually represent the workingsof the economy. There is also great uncertainty about the expectations of firms and consumers and their reactions to policy changes. Any policy is bound to fail if the information on which it was based is poor.6.The answer to this question is student specific. The main difficulties of stabilization policy arise fromthree sources. First, policy always works with lags. Second, the outcome of any policy depends on the way the private sector forms expectations and how those expectations affect the public's behavior.Third, there is considerable uncertainty about the structure of the economy and the shocks that hit it.It can be argued that a monetary policy rule would greatly reduce uncertainty about the Fed's policy responses. If the government behaved in a consistent way, then the private sector would also behave more consistently and economic fluctuations could be greatly reduced. A monetary growth rule would also reduce any political pressure the administration might exert on the Fed. It is often initially unclear whether a disturbance is temporary or persistent and a monetary policy rule would prevent policy mistakes in cases where the disturbance is, in fact, temporary. If active monetary policy is applied to a temporary disturbance, then the lags involved will guarantee that the economy will1 / 1actually be destabilized.On the other hand, the workings of the economy are not completely understood and events cannot always be predicted. Thus it is difficult to argue for a fixed policy rule. Unanticipated large disturbances warrant an activist policy, especially if they appear to be persistent. It is also possible to construct a more activist monetary growth rule. For example, Equation (8) suggests that the annual monetary growth rate should be increased by two percent for every one percent that unemployment increases above its natural rate. Such a rule is based on the quantity theory of money equation (which relates money supply growth to the growth of nominal GDP) and on Okun's law (which relates the unemployment rate to economic growth). Obviously, because of the long lags for monetary policy, any monetary growth rule will work much better in the long run than in the short run.Fiscal policy rules may make more sense than monetary policy rules, since fiscal policy has long inside lags but shorter outside lags. In a way, built-in stabilizers, although generally not considered "rules", already provide some stability without any inside lag. Many of the arguments against monetary policy rules are also valid for fiscal policy rules and many economists oppose them. The frequently proposed constitutional amendment requiring an annually balanced budget is an example of a fiscal policy rule. There are significant problems associated with such an amendment, since it would greatly limit the government's ability to undertake active fiscal stabilization policy.7. The arguments for a constant growth rate rule for money are based on the quantity theory of moneyequation, that is,MV = PY.From this equation we can derive%∆P = %∆M - %∆Y + %∆V.If the long-run trend rate of real output (Y) and the long-run trend of velocity (V) are assumed to be fairly stable, and if wages and prices are sufficiently flexible, then a constant monetary growth rate (M) would insure a constant rate of inflation, that is, a constant rate of change in the price level (P).Also, since monetary policy has long outside lags, active monetary policy can actually be more destabilizing than stabilizing. In addition, since we do not know exactly how the economy works or may react to specific policies, it is best to follow a rule rather than undertake actions that have uncertain outcomes. However, rules are not without problems, as they would not allow flexibility in responding to major disturbances.1 / 18. Dynamic inconsistency occurs if, after having committed themselves to a specific policy actiondesigned to achieve a long-run objective, policy makers find themselves in a situation where it seems advantageous to abandon their original policy, in order to achieve a short-run goal. Such action will impede the long-run objective.9. Real GDP targeting is the best option if the primary policy goal of monetary policy is to achieve fullemployment. If policy makers forecast potential GDP correctly, then full employment combined with low inflation can be achieved. However, real GDP targeting bears the greater risk that the secondary goal of achieving a low inflation rate will be missed. If the rate at which potential GDP grows is overestimated, then policy makers may stimulate the economy too much. In this case, they will not be successful in achieving price stability. By targeting nominal GDP, the central bank creates a policy tradeoff between inflation and unemployment. If the rate at which potential GDP grows is overestimated and policy makers stimulate the economy too much, we will get less growth but also less inflation than under real GDP targeting. Which targeting approach should be chosen depends greatly on how steep or flat the Phillips curve is perceived to be.Technical Problems:1. If actual GDP is expected to be $40 billion below the full-employment level and the size of thegovernment spending multiplier is 2, then government spending should be increased by $20 billion over its current level. For the next period, when actual GDP is expected to be $20 billion below potential, government spending should be cut by $10 billion from its new level, that is, to $10 billion over its original level. In period three, when actual GDP is expected to be at its full-employment level, the level of government spending should again be cut by $10 billion from the last period's level to bring it back to the original level of Period 0.2.a. If there is a one-period outside lag for government spending, then nothing can be done to close thecurrent GDP-gap. The government should decide to spend $10 billion more for the next period and reduce spending again to its original level after that.2.b. Graph I below shows the path of GDP for Problem 1 with no outside lag and Graph II shows the pathof GDP for problem 2.a. with a one-period outside lag. In each of the graphs the path of actual GDP is shown, first assuming that no policy action takes place and then assuming that the policies proposed in Problems 1 and 2.a. are undertaken.1 / 1Graph IGDP GDPpotential GDP potential GDP0 time 0 timeGDP with fiscal policy GDP without fiscal policyGraph IIGDP GDPpotential GDP potential GDP0 time 0 timeGDP with fiscal policy GDP without fiscal policy3.a. Since the government multiplier for the first period is 1, the level of government spending must beincreased by G = $40 billion to close the GDP-gap of $40 billion. But since the government multiplier in the next period for the amount spent in this period is 1.5, the effect of an increase in government spending in the first period by $40 billion would be an increase in GDP by $60 billion in the second period.3.b. For the second period a GDP-gap of $20 billion is expected. However, as we saw in 3.a., GDP willincrease by $60 billion in the second period if the government increases spending by $40 billion in the first period. Therefore, the government has to reduce spending in the second period by $40 billion from its new level (back to its original level), since the multiplier for a spending change in the same period is 1.3.c. In this problem, fiscal policy has an outside lag. This means that the effect of an increase ingovernment spending is felt both in the period in which the spending increase takes place and (to an even larger degree) in the following period. The increase in government spending needed to close the1 / 1GDP-gap in the first period is guaranteed to overshoot the desired goal in the next period. Thus the government will be forced to reverse its increase in spending to the original level in the second period to offset the destabilizing effect. In a case like this, the government has to be much more active in its fiscal policy than in a situation where no distributed lag exists.4. If there is uncertainty about the size of the multiplier, then fiscal policy becomes much morecomplicated. If the multiplier is 1, then an increase in government spending by $40 billion will close the GDP-gap in the first period. If the multiplier is 2.5, we will overshoot potential GDP by $60 billion. An increase in spending by 40/2.5 = $16 billion is optimal if the multiplier is 2.5. Thus a cautious government will probably increase spending by no more than $16 billion in the first period, and then reduce the level of spending by $8 billion in the next period ($8 billion above the original level). Such a policy action is designed to close the GDP-gap to some degree over the first two periods while never overshooting potential GDP. In Period 3 we will again be back at the full-employment level. The extent to which a less cautious government might exceed these suggested spending increases depends largely on that government's level of concern about unemployment versus inflation.5. To follow an established rule for its policy, the Fed needs to know the source of each disturbance. If adisturbance comes from the goods sector, it is better to have a monetary growth target; if the disturbance comes from the money sector, it is better to have an interest rate target.a. Assume a disturbance comes from the money sector. If an increase in money demand increases theinterest rate, the Fed should try to maintain a constant interest rate by increasing the supply of money.This will re-establish the old equilibrium values of the interest rate and output and effectively offset the disturbance.b. Assume a disturbance comes from the goods sector. If an increase in autonomous investmentincreases the interest rate, then it is not advisable to maintain a constant interest rate. Trying to lower the interest rate again by increasing the money supply would aggravate the disturbance. On the other hand, maintaining a constant money supply, while not offsetting the disturbance, will at least not make things worse.6.a. Students will have to check the Federal Reserve Bulletin in early 2000 and compare the forecasts ofthe Federal Reserve Board with the actual performance of the economy in 1999.6.b. Regardless of how detailed it is, no econometric model can accurately represent the economy, sincewe do not completely understand the way the economy works. Therefore, we can never expect perfect1 / 1forecasts. It is impossible to incorporate all the relevant information on which individuals and firms base their expectations about the future and to determine how these expectations affect actions in any given situation. Forecasts are generally based on the information available at the time, which may be flawed or outdated. In addition, any unexpected change, such as a supply shock, an unanticipated international change, or an unanticipated domestic policy change, can render the initial predictions wrong.1 / 1。
多恩布什宏观经济学答案
Chapter 2 national income accountingTechnical Problems1.The text calculates the change in real GDP in 1996 prices in the following way:[RGDP04 - RGDP96]/RGDP96 = [3.50 - 1.50]/1.50 = 1.33 = 133%.To calculate the change in real GDP in 2004 prices, we first have to calculate the GDP of 1996 in 2004 prices.Thus we take the quantities consumed in 1996 and multiply them by the prices of 2004, as follows:B eer 1 at $2.00 = $2.00Skittles 1 at $0.75 = $0.75_______________________________Total $2.75The change in real GDP can now be calculated as [6.25 - 2.75]/2.75 = 1.27 = 127%.We can see that the growth rate of real GDP calculated this way is roughly the same as the growth rate calculated above.2.a. The relationship between private domestic saving, private domestic investment, the budget deficit, and netexports is shown by the following identity:S - I ≡ (G + TR - TA) + NX.Therefore, if we assume that transfer payments (TR) remain constant, an increase in taxes (TA) has to be offset either by an increase in government purchases (G), an increase in net exports (NX), or a decrease in the difference between private domestic saving (S) and private domestic investment (I).2.b.From the equation YD ≡ C + S it follows that an increase in disposable income (YD) will be reflected in anincrease in consumption (C), saving (S), or both.2.c.From the equation YD ≡ C + S it follows that when either consumption (C) or saving (S) increases, disposableincome (YD) must increase as well.3.a. Since depreciation is defined as D = I g - I n = 800 - 200 = 600 ==>NDP = GDP - D = 6,000 - 600 = 5,400.3.b.From GDP = C + I g + G + NX ==> NX = GDP - C – I g - G ==>NX = 6,000 - 4,000 - 800 - 1,100 = 100.3.c.BS = TA - G - TR ==> (TA - TR) = BS + G ==> (TA - TR) = 30 + 1,100 = 1,1303.d.YD = Y - (TA - TR) = 6,000 - 1,130 = 4,8703.e. S = YD - C = 4,870 - 4,000 = 8704.a. S = YD - C = 5,100 - 3,800 = 1,3004.b.From S - I = (G + TR - TA) + NX ==> I = S - (G + TR - TA) - NX = 1,300 - 200 - (-100) = 1,200.2704.c.From Y = C + I + G + NX ==> G = Y - C - I - NX ==>G = 6,000 - 3,800 - 1,200 - (-100) = 1,100.Also: YD = Y - TA + TR ==> TA - TR = Y - YD = 6,000 - 5,100 ==> TA - TR = 900From BS = TA - TR - G ==> G = (TA - TR) - BS = 900 - (-200) ==> G = 1,100.5.According to Equation (2) in the text, the value of total output (in billions of dollars) can be calculated as: Y =labor payments + capital payments + profits = $6 + $2 + $0 = $8.6.a.Since nominal GDP is defined as the market value of all final goods and services currently produced in thiscountry, we can only measure the value of the final product (bread), and therefore we get $2 million (since 1 million loaves are sold at $2 each).6.b.An alternative way of measuring GDP is to calculate all the value added at each step of production. The totalvalue of the ingredients used by the bakeries can be calculated as:1,200,000 pounds of flour ($1 per pound) = 1,200,000100,000 pounds of yeast ($1 per pound) = 100,000100,000 pounds of sugar ($1 per pound) = 100,000100,000 pounds of salt ($1 per pound) = 100,000__________________________________________________________= 1,500,000Since $2,000,000 worth of bread is sold, the total value added at the bakeries is $500,000.7.If the CPI increases from 2.1 to 2.3, the rate of inflation can be calculated in the following way:rate of inflation = (2.3 - 2.1)/2.1 = 0.095 = 9.5%.The CPI often overstates inflation, since it is calculated by using a fixed market basket of goods and services.But the fixed weights in the CPI's market basket cannot capture the tendency of consumers to substitute away from goods whose relative prices have increased. Quality improvements in goods also often are not adequately taken into account. Therefore, the CPI will overstate the increase in consumers' expenditures.8.The real interest rate (r) is defined as the nominal interest rate (i) minus the rate of inflation (π). Therefore thenominal interest rate is the real interest rate plus the rate of inflation, ori = r + π = 3% + 4% = 7%.Chapter 3Growth theory, exogenous.1.a.According to Equation (2), the growth of output is equal to the growth in lab or times labor’s share ofincome plus the growth of capital times capital’s share of income plus the rate of technical progress, that is,∆Y/Y = (1 - θ)(∆N/N) + θ(∆K/K) + ∆A/A, where2711 - θ is the share of labor (N) and θ is the share of capital (K). Therefore, if we assume that therate of technological progress is zero (∆A/A = 0), output grows at an annual rate of 3.6 percent, since ∆Y/Y = (0.6)(2%) + (0.4)(6%) + 0% = 1.2% + 2.4% = + 3.6%,1.b.The so-called "Rule of 70" suggests that the length of time it takes for output to double can becalculated by dividing 70 by the growth rate of output. Since 70/3.6 = 19.44, it will take just under 20 years for output to double at an annual growth rate of 3.6%,1.c.Now that ∆A/A = 2%, we can calculate economic growth as∆Y/Y = (0.6)(2%) + (0.4)(6%) + 2% = 1.2% + 2.4% + 2% = + 5.6%.Thus it will take 70/5.6 = 12.5 years for output to double at this new growth rate of 5.6%.2.a.According to Equation (2), the growth of output is equal to the growth in labor times the labor shareplus the growth of capital times the capital share plus the growth rate of total factor productivity, that is,∆Y/Y = (1 - θ)(∆N/N) + θ(∆K/K) + ∆A/A, where1 - θ is the share of labor (N) and θ is the share of capital (K). In this example θ = 0.3; therefore,if output grows at 3% and labor and capital grow at 1% each, we can calculate the change in total factor productivity in the following way3% = (0.7)(1%) + (0.3)(1%) + ∆A/A ==> ∆A/A = 3% - 1% = 2%,that is, the growth rate of total factor productivity is 2%.2.b.If both labor and the capital stock are fixed, that is, ∆N/N = ∆K/K = 0, and output grows at 3%, thenall the growth has to be contributed to the growth in total factor productivity, that is, ∆A/A = 3%.3.a.If the capital stock grows by ∆K/K = 10%, the effect on output will be an additional growth rate of∆Y/Y = (0.3)(10%) = 3%.3.b.If labor grows by ∆N/N = 10%, the effect on output will be an additional growth rate of∆Y/Y = (0.7)(10%) = 7%.3.c.If output grows at ∆Y/Y = 7% due to an increase in labor by ∆N/N = 10% and this increase in labor isentirely due to population growth, then per-capita income will decrease and people’s welfare will decrease, since∆y/y = ∆Y/Y - ∆N/N = 7% - 10% = - 3%.2723.d.If the increase in labor is due to an influx of women into the labor force, the overall population doesnot increase, and income per capita will increase by y/y = 7%. Therefore people's welfare (or at least their living standard) will increase.4.Figure 3-4 shows output per head as a function of the capital-labor ratio, that is, y = f(k). Thesavings function is sy = sf(k) and it intersects the (n + d)k-line, representing the investment requirement. At this intersection, the economy is in a steady-state equilibrium. Now let us assume that the economy is in a steady-state equilibrium before the earthquake hits, that is, the capital-labor ratio is currently k*. Assume further, for simplicity, that the earthquake does not affect pe oples’ savings behavior.If the earthquake destroys one quarter of the capital stock but less than one quarter of the labor force, then the capital-labor ratio will fall from k* to k1 and per-capita output will fall from y* to y1.Now saving is greater than the investment requirement, that is, sy1 > (d + n)k1, and the capital stock and the level of output per capita will grow until the steady state at k* is reached again.However, if the earthquake destroys one quarter of the capital stock but more than one quarter of the labor force, then the capital-labor ratio will increase from k* to k2. Saving (and gross investment) now will be less than the investment requirement and thus the capital-labor ratio and the level of output per capita will fall until the steady state at k* is reached again.If exactly one quarter of both the capital stock and the labor stock are destroyed, then the steady state will be maintained, that is, the capital-labor ratio and the output per capita will not change.If the severity o f the earthquake has an effect on peoples’ savings behavior, the savings function sy = sf(k) will move either up or down, depending on whether the savings rate (s) increases (if people save more, so more can be invested in an effort to rebuild) or decreases (if people save less, since they decide that life is too short not to live it up). But in either case, a new steady-state equilibrium will be reached.k1k k2 k5.a.An increase in the population growth rate (n) affects the investment requirement. As n gets larger, the(n + d)k-line gets steeper. As the population grows, increases in saving and investment will be required to equip new workers with the same amount of capital that existing workers already have.273Since the population will now be growing faster than output, income per capita (y) will decrease anda new optimal capital-labor ratio will be determined by the intersection of the sy-curve and the new(n1 + d)k-line. Since per-capita output will fall, we will have a negative growth rate in the short run.However, the steady-state growth rate of output will increase in the long run, since it will be determined by the new and higher rate of population growth.y oy1k1k o k5.b.Starting from an initial steady-state equilibrium at a level of per-capita output y*, the increase in thepopulation growth rate (n) will cause the capital-labor ratio to decline from k* to k1. Output per capita will also decline, a process that will continue at a diminishing rate until a new steady-state level is reached at y1. The growth rate of output will gradually adjust to the new and higher level n1.yy*y1t o t1tkk*k1t o t1t6.a.Assume the production function is of the formY = F(K, N, Z) = AK a N b Z c==>274∆Y/Y = ∆A/A + a(∆K/K) + b(∆N/N) + c(∆Z/Z), with a + b + c = 1.Now assume that there is no technological progress, that is, ∆A/A = 0, and that capital and labor grow at the same rate, that is, ∆K/K = ∆N/N = n. If we also assume that all available natural resources are fixed, such that ∆Z/Z = 0, then the rate of output growth will be∆Y/Y = an + bn = (a + b)n.In other words, output will grow at a rate less than n since a + b < 1, and output per worker will fall.6.b.If there is technological progress, that is, ∆A/A > 0, then output will grow faster than before, namely∆Y/Y = ∆A/A + (a + b)n.If ∆A/A < cn, output will grow at a lower rate than n, in which case output per worker will still decrease.If ∆A/A = cn, output will grow at the same rate as n, in which case output per worker will remain the same.But if ∆A/A > cn, output will grow at a rate higher than n, in which case output per worker will increase.6.c.If the supply of natural resources is fixed, then output can only grow at a rate that is smaller than therate of population growth and we should expect limits to growth as we run out of natural resources.However, if the rate of technological progress is sufficiently large, then output can grow at a rate faster than population, even if we have a fixed supply of natural resources.7.a.If the production function is of the formY = K1/2(AN)1/2,and A is normalized to 1, we haveY = K1/2N1/2 .In this case, capital's and labor's shares of income are both 50%.7.b.This is a Cobb-Douglas production function.7.c. A steady-state equilibrium is reached when sy = (n + d)k.From Y = K1/2N1/2 ==> Y/N = K1/2N-1/2==> y = k1/2 ==> sk1/2 = (n + d)k==> k-1/2 = (n + d)/s = (0.07 + 0.03)/(.2) = 1/2 ==> k1/2 = 2 = y ==> k = 4 .7.d.At the steady-state equilibrium, output per capita remains constant, since total output grows at thesame rate as the population (7%), as long as there is no technological progress, that is, ∆A/A = 0. But275if total factor productivity grows at ∆A/A = 2%, then total output will grow faster than population, that is, at 7% + 2% = 9%, so output per capita will grow at 2%.8.a.If technological progress occurs, then the level of output per capita for any given capital-labor ratioincreases. The function y = f(k) increases to y = g(k), and thus the savings function increases from sf(k) to sg(k).8.b.Since g(k) > f(k), it follows that sg(k) > sf(k) for each level of k. Therefore, the intersection of thesg(k)-curve with the (n + d)k-line is at a higher level of k. The new steady-state equilibrium will now be at a higher level of saving and output per capita, and at a higher capital-labor ratio.8.c.After the technological progress occurs, the level of saving and investment will increase until a newand higher optimal capital-labor ratio is reached. The investment ratio will increase in the transition period, since more investment will be required to reach the higher optimal capital-labor ratio.9.The Cobb-Douglas production function is defined asY = F(N, K) = AN1-θKθ.The marginal product of labor can then be derived asMP N = (∆Y)/(∆N) = (1 - θ)AN-θKθ = (1 - θ)AN1-θKθ/N = = (1 - θ)(Y/N)== > labor's share of income = [MP N*N]/Y = [(1 - θ)(Y/N)](N/Y) = (1 - θ).Chapter 4Growth theory, endogenous1.a. A production function that displays both a diminishing and a constant marginal product of capital canbe displayed by drawing a curved line (as in an exogenous growth model), followed by an upward-sloping line (as in an endogenous growth model). Such a graph is depicted below.1.b.The first equilibrium (Point A in the graph below) is a stable low-income steady-state equilibrium.Any deviation from that point will cause the economy to eventually adjust again at the same steady-state income level (and capital-output ratio). The second equilibrium (Point B) is an unstable high-income steady-state equilibrium. Any deviation from that point will lead to either a lower income steady-state equilibrium back at Point A (if the capital-labor ratio declines) or ongoing growth (if the capital-labor ratio increases). In the latter case, not only total output but also output per capita continues to grow.1.c. A model like the one in this question can be used to explain how some countries find themselves insituations with no growth and low income while others have ongoing growth and a high level of income. In the first case, a country may have invested mostly in physical capital, leading to some short-term growth at the expense of long-term growth. In the second case, a country may have invested not only in physical capital but also in human capital (education, skills, and training), reaping significant social returns.2762.a.If population growth is endogenous, that is, if a country can influence the rate of population growththrough government policies, then the investment requirement is no longer a straight line. Instead it is curved as depicted below.2.b.The first equilibrium (Point A) is a stable steady-state equilibrium. This is a situation of low incomeand high population growth, indicating that the country is in a poverty trap. The second equilibrium (Point B) is an unstable steady-state equilibrium. This is a situation of medium income and low population growth. The third equilibrium (Point C) is a stable steady-state equilibrium. This is a situation of high income and low population growth. In none of these three cases do we have ongoing growth. For any capital stock k < k B, the economy will adjust to k A, but for any capital stock k > k b (even for k > k c), the economy will adjust to k B. During the adjustment process to any of these two steady-state equilibria, the change in output per capita only will be transitory.2.c.To escape the poverty trap (Point A), a country has several possibilities: First, it can somehow find themeans to increase the capital-labor ratio above a level consistent with Point B (perhaps by borrowing funds or seeking direct foreign investment). Second, it can increase the savings rate such that the savings function no longer intersects the investment requirement curve at either Point A or Point B.Third, it can decrease the rate of population growth through specifically designed policies, such that the investment requirement shifts down and no longer intersects with the savings function at Points A or B.3.a.If we incorporate endogenous population growth into a two-sector model in Problem 2, we get acurved investment requirement line and a production function with first a diminishing and then a constant marginal product of capital as depicted below. (Note that the savings function has the same shape as the production function.)3.b. Here we should have four intersections of the savings function sf(k) and the investment requirement[n(y)+d]k. The first equilibrium (at Point A) is a stable low-income steady-state equilibrium. Any deviation from that point will cause the economy to eventually adjust again at the same steady-state income level (and capital-output ratio). The second equilibrium (at Point B) is an unstable low-income equilibrium. Any deviation from that point will lead to either a lower income steady-state equilibrium at Point A (if the capital-labor ratio declines) or a higher income steady-state equilibrium at Point C (if the capital-labor ratio increases). Since Point C is a stable equilibrium, the economy will settle back at that point again whether the capital stock increases or declines. Point D is again an unstable equilibrium but at a high level of income. Any deviation from that point will lead to either a lower income steady-state equilibrium at Point C (if the capital-labor ratio declines) or ongoing growth (if the capital-labor ratio increases).3.c.This model is more inclusive than either of the two models discussed previously and therefore hasgreater explanatory power. While the graphical analysis is far more complicated, we can now see more clearly that a poor country cannot escape the poverty trap at Point A unless it somehow succeeds in increasing the capital-labor ratio (and thus per-capita income) beyond the level at Point B.4.a.The production function is of the formY = K1/2(AN)1/2 = K1/2(4[K/N]N)1/2= K1/2(4K)1/2 = 2K.From this we can see that a = 2 since277Y = Y/N = 2(K/N) == > y = 2k.4.b.Since a = y/k = 2, it follows that the growth rate of output and capital is∆y/y = ∆k/k = g = sa - (n + d) = (0.1)2 - (0.02 + 0.03) = 0.15 = 15%.4.c.The term "a" in the equation above stands for the marginal product of capital. By assuming that thelevel of labor-augmenting technology (A) is proportional to the capital-labor ratio (k), it is implied that the level of technology depends on the amount of capital per worker that we have, which may not be realistic.4.d.In this model, we have a constant marginal product of capital and therefore we have an endogenousgrowth model.5.a.The production function is of the formY = K1/2N1/2==> Y/N = (K/N)1/2 ==> y = k1/2.From k = sy/(n + d) = sk1/2/(n +d) ==> k1/2 = s/(n + d)==> y* = s/(n + d) = (0.1)/(0.02 + 0.03) = 2==> k* = sy*/(n + d) = (0.1)(2)/(0.02 + 0.03) = 4.5.b.Steady-state consumption equals steady-state income minus steady-state saving (or investment), thatis,c* = y – sy = f(k*) - (n + d)k* .The golden-rule capital stock corresponds to the highest permanently sustainable level of consumption. Steady-state consumption is maximized when the marginal increase in capital produces just enough extra output to cover the increased investment requirement.From c = k1/2 - (n + d)k ==> (∆c/∆k) = (1/2)k-1/2 - (n + d) = 0==> k-1/2 = 2(n + d) = 2(.02 + .03) = .1==> k1/2 = 10 ==> k = 100.Since k* = 4 < 100, we have less capital at the steady state than the golden rule suggests.5.c.From k = sy/(n + d) = sk1/2/(n + d) ==> s = k1/2(n + d) = 10(0.05) = 0.5.5.d.If we have more capital than the golden rule suggests, we are saving too much and do not have theoptimal amount of consumption.Chapter 9Income and spending2781.a. AD = C + I = 100 + (0.8)Y + 50 = 150 + (0.8)YThe equilibrium condition is Y = AD ==>Y = 150 + (0.8)Y ==> (0.2)Y = 150 ==> Y = 5*150 = 750.1.b.Since TA = TR = 0, it follows that S = YD - C = Y - C. ThereforeS = Y - [100 + (0.8)Y] = - 100 + (0.2)Y ==> S = - 100 + (0.2)750 = - 100 + 150 = 50.As we can see S = I, which means that the equilibrium condition is fulfilled.1.c.If the level of output is Y = 800, then AD = 150 + (0.8)800 = 150 + 640 = 790.Therefore the amount of involuntary inventory accumulation is UI = Y - AD = 800 - 790 =10.1.d. AD' = C + I' = 100 + (0.8)Y + 100 = 200 + (0.8)YFrom Y = AD' ==> Y = 200 + (0.8)Y ==> (0.2)Y = 200 ==> Y = 5*200 = 1,000Note: This result can also be achieved by using the multiplier formula:∆Y = (multiplier)(∆Sp) = (multiplier)(∆I) ==> ∆Y = 5*50 = 250,that is, output increases from Y o = 750 to Y1 = 1,000.1.e.From 1.a. and 1.d. we can see that the multiplier is α = 5.2.a.Since the mpc has increased from 0.8 to 0.9, the size of the multiplier is now larger. Therefore weshould expect a higher equilibrium income level than in 1.a.AD = C + I = 100 + (0.9)Y + 50 = 150 + (0.9)Y ==>Y = AD ==> Y = 150 + (0.9)Y ==> (0.1)Y = 150 ==> Y = 10*150 = 1,500.2.b.From ∆Y = (multiplier)(∆I) = 10*50 = 500 ==> Y1 = Y o + ∆Y = 1,500 + 500 = 2,000.2.c.Since the size of the multiplier has doubled from α = 5 to α1 = 10, the change in output (Y) that resultsfrom a change in investment (I) now has also doubled from 250 to 500.3.a. AD = C + I + G + NX = 50 + (0.8)YD + 70 + 200 + 0 =320 + (0.8)[Y - TA + TR]= 320 + (0.8)[Y - (0.2)Y + 100] = 400 + (0.8)(0.8)Y = 400 + (0.64)YFrom Y = AD ==> Y = 400 + (0.64)Y ==> (0.36)Y = 400279==> Y = (1/0.36)400 = (2.78)400 = 1,111.11The size of the multiplier is α = 1/0.36) = 2.78.3.b.BS = tY - TR - G = (0.2)(1,111.11) - 100 - 200 = 222.22 - 300 = - 77.783.c.AD' = 320 + (0.8)[Y - (0.25)Y + 100] = 400 + (0.8)(0.75)Y = 400 + (0.6)YFrom Y = AD' ==> Y = 400 + (0.6)Y ==> (0.4)Y = 400 ==> Y = (2.5)400 = 1,000The size of the multiplier is now reduced to α1 = (1/0.4) = 2.5.3.d.The size of the multiplier and equilibrium output will both increase with an increase in the marginalpropensity to consume. Therefore income tax revenue will also go up and the budget surplus should increase. This can be seen as follows:BS' = (0.25)(1,000) - 100 - 200 = - 50 ==> BS' - BS = - 50 - (-77.78) = + 27.783.e.If the income tax rate is t = 1, then all income is taxed. There is no induced spending and equilibriumincome always increases by exactly the change in autonomous spending. In other words, the size of the expenditure multiplier is 1.From Y = C + I + G ==> Y = C o + c(Y - TA + TR) + I o + G o = C o + c(Y - 1Y + TR o) + I o + G o ==> Y = C o + cTR o + I o + G o = A o==> ∆Y = ∆A o4.On first sight, one may want to conclude that this is an application of the balanced budget theorem,since, as long as Y = 1,000, a change in the tax rate by 5% will cause total tax revenues to change by ∆TA = 50, which is the same as the change in government purchases, that is, ∆G = 50. As long as income (Y) stays the same, the budget surplus will not be affected. However, this combined fiscal policy change will have an effect on national income and, since national income goes up, so does the government’s tax revenue, due to the fact that we have income taxation. Therefore we should expect an increase in the budget surplus. This can easily be shown with a numerical example.For example, in Problem 3.d. we had a situation where the following was given:Y o = 1,000, t o = 0.25, G o = 200 and BS o = - 50.Assume now that t1 = 0.3 and G1 = 250 ==>AD' = 50 + (0.8)[Y - (0.3)Y + 100] + 70 + 250 = 370 + (0.8)(0.7)Y + 80 = 450 + (0.56)Y.From Y = AD' ==> Y = 450 + (0.56)Y ==> (0.44)Y = 450==> Y = (1/0.44)450 = 1,022.73280BS1 = (0.3)(1,022.73) - 100 - 250 = 306.82 - 350 = - 43.18 == > BS1– BS o = -43.18 - (-50) = + 6.82Therefore we see that the budget surplus has increased, since the increase in income tax revenue is larger than the increase in government purchases.5.a.While an increase in government purchases by ∆G = 10 will change intended spending by ∆Sp = 10,a decrease in government transfers by ∆TR = -10 will change intended spending by a smaller amount,that is, by only ∆Sp = c(∆TR) = c(-10). The change in intended spending equals ∆Sp = (1 - c)(10) and equilibrium income should therefore increase by∆Y = (multiplier)(1 - c)10.5.b.If c = 0.8 and t = 0.25, then the size of the multiplier isα = 1/[1 - c(1 - t)] = 1/[1 - (0.8)(1 - 0.25)] = 1/[1 - (0.6)] = 1/(0.4) = 2.5.The change in equilibrium income is∆Y = α(∆A o) = α[∆G + c(∆TR)] = (2.5)[10 + (0.8)(-10)] = (2.5)2 = 55.c.The budget surplus should increase, since the level of equilibrium income has increased and thereforethe level of tax revenues has increased, while the changes in government purchases and transfer payments cancel each other out. Numerically, this can be shown as follows:∆BS = t(∆Y) - ∆TR - ∆G = (0.25)(5) - (-10) - 10 = 1.25Chapter 10Money, interest, fiscal policy1.a. Each point on the IS-curve represents an equilibrium in the expenditure sector. (Note that this is aclosed economy, that is, NX = 0).The IS-curve can be derived by setting actual income equal to intended spending, orY = C + I + G = (0.8)[1 - (0.25)]Y + 900 - 50i + 800 = 1,700 + (0.6)Y - 50i ==>(0.4)Y = 1,700 - 50i ==> Y = (2.5)(1,700 - 50i) ==> Y = 4,250 - 125i.1.b.The IS-curve shows all combinations of the interest rate and output level such that the expendituresector (the goods market) is in equilibrium, that is, actual output equals intended spending. A decrease in the interest rate stimulates investment spending, making intended spending greater than actual output. The resulting unintended inventory decrease leads firms to increase their production until actual output is again equal to intended spending. This means that the IS-curve is downward sloping.1.c.Each point on the LM-curve represents an equilibrium in the money sector. Therefore the LM-curvecan be derived by setting real money supply equal to real money demand, that is,281M/P = L ==> 500 = (0.25)Y - 62.5i ==> Y = 4(500 + 62.5i) ==> Y = 2,000 + 250i.1.d.The LM-curve shows all combinations of the interest rate and level of output such that the moneysector is in equilibrium, that is, the demand for real money balances is equal to the supply of real money balances. An increase in income will increase the demand for real money balances. Given a fixed real money supply, this will lead to an increase in interest rates, which will then reduce the quantity of real money balances demanded until the money market clears again. In other words, the LM-curve is upward sloping.1.e.The level of income (Y) and the interest rate (i) at the equilibrium are determined by the intersectionof the IS-curve with the LM-curve. At this point, the expenditure sector and the money sector are both in equilibrium simultaneously.From IS = LM ==> 4,250 - 125i = 2,000 + 250i ==> 2,250 = 375i ==> i = 6==> Y = 4,250 - 125*6 = 4,250 - 750 ==> Y = 3,500Check: Y = 2,000 + 250*6 = 2,000 + 1,500 = 3,500i125 ISLM62,000 3,500 4,250 Y2.a.As we have seen in 1.a., the value of the expenditure multiplier is α = 2.5. This multiplier is derivedin the same way as in Chapter 9. But now intended spending also depends on the interest rate, so we no longer have Y = αA o, but ratherY = α(A o - bi) = (1/[1 - c + ct])(A o - bi) ==> Y = (2.5)(1,700 - 50i) = 4,250 - 125i.2.b.In the IS-LM model, an increase in government purchases (G) will have a smaller effect on outputthan in the model of the expenditure sector used in Chapter 9, in which interest rates are assumed to be fixed. This can be answered most easily with a numerical example. Assume that government purchases increase by ∆G = 300. The IS-curve shifts parallel to the right by==> ∆IS = (2.5)(300) = 750.Therefore, the equation of the new IS-curve is: Y = 5,000 - 125i.282。
多恩布什 宏观经济学 课后答案01
Problems1. "A country's rate of economic growth is determined solely by the amount ofresources available to the country." Comment on this statement.Increases in the availability of resources, that is, labor and capital used in the production of goods and services account for only part of a nation's economic growth. The efficiency with which these factors of production are used also affects economic growth. Increases in the efficiency of production result from increases in the education and skill levels of the labor force and from newer and more efficient technology. In addition, the factors of production are not fully employed all the time. During an expansion or recovery, the use of the factors of production increases, which leads to an increase in production and output.2. In the 1960s, increases in the rate of unemployment were generally associatedwith decreases in the inflation rate and vice versa. But in the 1970s and 1980s unemployment and inflation often moved in the same direction. How can you explain this?A shift in aggregate demand causes the unemployment rate and the inflation rate to move inopposite directions, whereas a shift in aggregate supply causes unemployment and inflation to move in the same direction. Most disturbances in the 1960s came from the demand side, while many of the disturbances in the 1970s and 1980s came from the supply side.3. "Since the long-run AS-curve is vertical, we can conclude that the total real outputof a nation cannot grow in the long run." Comment on this statement.The AD-AS framework is a static framework that assumes that the level of potential GDP is fixed. However, the potential GDP of a nation grows over time as the amount of available resources or the efficiency with which these resources are used increases. Figure 1-4 in the text clearly indicates that the long-run (vertical) AS-curve moves to the right by a small percentage each year.4. "Long-run growth can best be studied by focussing on the reasons for businesscycles." Comment on this statement.Growth theory focuses primarily on the accumulation of inputs and improvements in technology that allow for an increased standard of living over time.Since growth theory tries to explain the average growth rate of an economy over many years, it ignores the short-run fluctuations (recessions and booms) that occur over the course of business cycles.5. "In the very short run real output is fixed and therefore any increase in aggregatedemand will simply increase the price level but not affect how many goods andservices are produced in an economy." Comment on this statement.The short-run AS-curve is completely horizontal, based on the assumption that prices are constant. An increase in aggregate demand will therefore increase the level of output but will not affect the price level. It follows therefore that in the short run the level of output is solely determined by aggregate demand.6. "There is always a clear tradeoff between unemployment and inflation." Comment.The short-run Phillips curve describes an empirical relationship between wage and price inflation and the rate of unemployment. This curve shows that the higher the rate of unemployment, the lower the rate of inflation and vice versa (at least in the short run). However, in the long run there is no clear-cut tradeoff between inflation and unemployment. The economic events of the 1970s and 1980s showed us that unemployment and inflation can increase or decrease simultaneously.7. The index of leading economic indicators is supposed to signal future developmentsin the economy and is calculated from variables in different sectors of the economy.Pick one leading economic indicator from each of the following sectors and briefly state the rationale for including this indicator in the calculation of the index:(1) the labor sector, (2) business activity, (3) the financial sector, and (4) residentialconstruction.The answer to this question is student specific. Here is a sample answer.The labor sector:Employment figures as well as the unemployment rate should be used to look for changes in the labor sector. The unemployment rate is more often discussed in the media, but the employment figures have smaller cyclical variations and are thus a better indicator of labor market conditions.Business activity:New orders, changes in inventories, capacity utilization, and industrial production are often used to interpret business activity. When using inventory changes it is important to distinguish between desired inventory changes, which may reflect changes in business expectations, and undesired inventory changes that reflect changes in the demand for the product.The financial sector:Stock market activity, changes in money supply, or credit conditions can be used to show trends in financial markets. While the relationship between changes in stock values and the economy is not as close as it used to be, a continued increase in stock prices generally reflects increased optimism about future economic conditions. It also means an increase in wealth for stockholders and easier access to funds for firms wishing to make new investments.Residential construction:A change in new building permits or housing starts may be the first sign of changing economic conditions. The housing sector is very sensitive to interest rate changes and tends to be indicative of other sectors of the economy, which often react in a similar way although to a lesser degree and with a time lag.8. Briefly discuss the usefulness of each of the following as leading economicindicators:(i) inventory changes, (ii) the GDP-deflator, (iii) the unemployment rate,(iv) the Dow Jones Industrial Average.Desired inventory changes reflect changes in business expectations and can be used as a leading economic indicator. But undesired inventory changes reflect changes in demand for the product and are therefore a lagging economic indicator. Only if one can separate out desired from undesired inventory changes, will it be possible to spot more clearly signs of an upcoming boom or recession.The GDP-deflator is the most complete price index, since it measures price changes of all final goods and services currently produced in a country. But the GDP-deflator is a lagging indicator, showing what has happened over the last quarter. In addition, initial GDP data tend to be fairly unreliable and have to be frequently revised.The unemployment rate has fairly small cyclical variations and is used as a measure for variations in the demand for labor. Changes in the unemployment rate also correspond well with changes in GDP. But the unemployment rate is a concurrent indicator.Changes in stock values generally reflect changes in expectations of financial investors about dividends. If stock values go up people may feel wealthier and thus consumer spending may increase. Firms may have an easier time issuing new stock and thus they may invest more. In this case, we can expect an economic upswing. However, changes in stock values often may simply be due to speculative behavior and may not be related to real economic activity.9. In each of the three pairs below, which variable would you choose (and why) as aleading economic indicator:(i) labor productivity or the unemployment rate(ii) the CPI or the PPI(iii) stock market changes or housing startsLabor productivity generally shows long run trends in the labor market and will determine wages and therefore living standards. It is a leading indicator, but cannot be easily used for forecasting.The unemployment rate has fairly small cyclical variations and is used as a measure for variations in the demand for labor. It is a very accurate measure of economic performance--at least as far as the labor sector is concerned. However, the unemployment rate is a concurrentand not a leading indicator.The CPI measures the price increase of a fixed market basket of 386 goods and services purchased by an average urban family. The CPI is easily available and is supposed to measure cost of living increases. However, the CPI is a concurrent indicator.The PPI measures average price changes of a market basket of over 1,000 intermediate goods up to the retail stage. It is relatively easily available and shows future price trends with relative accuracy. The PPI is a leading indicator and does not always correspond exactly with the CPI.Stock market changes reflect changes in expectations of financial investors about dividends arising from a perceived change in economic conditions. If stock values increase consumers may feel wealthier (and thus spend more), and firms have an easier time issuing new stock (and thus invest more). But while a change in stock values may indicate an upcoming change in economic conditions, it also could simply have been caused by speculative behavior. Thus, it is a leading indicator that is, however, not always reliable.The demand for housing is very interest sensitive, since mortgage interest payments are a large part housing costs. Housing starts tend to increase sharply when interest rates drop to low levels, that is, when the economy is at the bottom of a recession. A change in housing starts thus is often seen as a turning point in the economy, since other sectors in the economy are expected to react similarly to changes in interest rates but with a lag and to a lesser degree. The increase in construction work naturally also stimulates economic activity in other sectors of the economy. Thus housing starts is seen as a fairly reliable leading economic indicator.。
多恩布什《宏观经济学》配套题库【课后习题-重大事件】【圣才出品】
圣才电子书 十万种考研考证电子书、题库视频学习平台
从美联储 1979 年 10 月改变其货币政策开始,在美国整个反通货膨胀时期,一直着重强 调政策的可信性。理性预期的一些支持者甚至相信只要政策可信,就有可能在抑制通货膨胀 的同时不产生任何经济衰退。
这一论点是这样考虑的:预期增长总供给曲线是: e Y Y 。
4.信任奖励(credibility bonus) 答:信任奖励又称信誉红利,指在理性预期下政府政策的可信性所获得的报偿。政府在 降低通货膨胀的斗争中,由于公众相信政府的反通货膨胀政策会得到执行从而降低通货膨胀 预期,这样即使政策未执行也会使通货膨胀降低,从而避免经济的衰退,政府政策的可信性 便获得了报偿。 通货膨胀是由经济的基本方面(总需求与总供给的相对变动)所决定的。在恶性通货膨 胀中,货币的增长支配了所有的其他基本因素。但是,人们关于未来的预期也发挥了作用。 相信政策已经改变本身就会驱动预期的通货膨胀率下降,并且因此而引起短期的菲利普斯曲 线向下移动。所以,在反通货膨胀的战斗中,一种可信任的政策会赢得社会对可信性的褒奖。
6.可信的政策(credible policy) 答:可信的政策指人们相信政府将会遵循的政策。可信的政策有利于赢得公众的信心,
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圣才电子书 十万种考研考证电子书、题库视频学习平台
从而在最大程度上降低政策成本。政府政策的可信度不高,会降低公众对政府的信心,使得 政府无法引导公众预期,加大政策执行难度。因此,政府应该努力提高政策的可信性,合理 引导公众预期,降低政策成本。
如果政策是可信的,当货币增长被调整到一个新的较低水平上时,人们会随之调整他们 的通货膨胀预期,短期总供给曲线因而立即下移。相应地,如果政策是可信的、预期是理性 的,当政策发生变化时,经济就可以迅速移动到新的长期均衡。换言之,如果政策是可信的, 就可以因 e 的下降而减少,经济则因较低的( Y Y )而遭受较低的痛苦。
多恩布什《宏观经济学》(英文第八版)答案-第六章
Chapter 6 Solutions to the Problems in the Textbook:Conceptual Problems:1. The aggregate supply curve and the Phillips curve describe very similar relationships and bothcurves can be used to analyze the same phenomena. The AS-curve shows a relationship between the price level and the level of output. The Phillips curve shows a relationship between the rate of inflation and the unemployment rate, given certain inflationary expectations. For example, a movement along the AS-curve depicts an increase in the price level that is associated with an increase in the level of output. As output increases, the rate of unemployment decreases (see Okun’s law).Therefore, with a larger increase in the price level (a higher level of inflation) there will be a decrease in unemployment, creating a downward-sloping Phillips curve.This downward sloping Phillips curve shifts whenever inflationary expectations change. If one assumes that workers will change their wage demands whenever their inflationary expectations change, one can conclude that a shift in the Phillips curve corresponds to a shift in the upward sloping AS-curve, since higher wages mean higher cost of production.2. In the short run, when wages and prices are assumed to be fixed, there can be no inflation and thusthe Phillips curve makes no sense over this very brief time frame. But in the medium run (in this chapter also often referred to as the short run), the Phillips curve is downward sloping as inflationary expectations are assumed to be constant. In the long run, the Phillips curve is vertical at the natural rate of unemployment, which corresponds to the vertical long-run AS-curve at the full-employment level of output.3. A variety of explanations are given in this chapter for the stickiness of wages in the short orintermediate run. One is that workers have imperfect information and nobody knows the actual price level. People don’t know whether a change in their nominal wage is the result of an increase in prices or in the real wage they receive for the work they provide. Due to this uncertainty, labor markets will not clear immediately. Another argument relies on coordination problems, that is, different firms within an economy cannot coordinate price changes in response to monetary policy changes.Individual firms change their prices only reluctantly, since they are afraid of losing market share. The efficiency wage theory argues that employers pay above market-clearing wages to motivate their workers to work harder. Firms are also reluctant to change wages because of the perceived menu costs involved. There are long-term relations between firms and workers and wages are usually set in nominal terms by wage contracts, which are renegotiated only periodically. Thus real wages fluctuate over time as the price level changes. Finally, the insider-outsider model argues that firms negotiate only with their own employees but not with unemployed workers. Since a turnover in the labor force is costly to firms, they are willing to offer above market-clearing wages to the currently employed rather than hiring the unemployed who may be willing to work for lower wages.These different views are not necessarily mutually exclusive and it is up to students to decide which of the arguments presented here they find most plausible. The explanations differ mainly in their assumption of how fast markets clear and whether employment variations are voluntary.4.a. Stagflation is defined as a period of high unemployment accompanied by high inflation.4.b. Stagflation can occur in time periods when people have high inflationary expectations. If theeconomy goes into a recession, the actual rate of inflation will fall below the expected rate of inflation.However, the actual inflation rate may still be very high while the rate of unemployment is increasing.For example, the Fed may have let money supply grow much too fast in the past, so everyone expectsa high inflation rate. If a supply shock occurs, we will see an increase in the rate of unemploymentwhile inflationary expectations and actual inflation remain very high. This scenario occurred during the 1970s. Once we have reached such a situation, it becomes necessary to design policies that will reduce inflationary expectations to shift the Phillips curve back to the left.5. Assume a disturbance occurs and the AD-curve shifts to the right. Unemployment decreases andinflation increases, and we move along the downward sloping Phillips curve to the left. However, as soon as people realize that actual inflation is higher than their inflationary expectations, they adjust their inflationary expectations upward and the downward-sloping Phillips curve shifts to the right, eventually returning unemployment back to its natural rate. In other words, the economy adjusts back at the full-employment level of income.If an adverse supply shock occurs (the upward-sloping AS-curve shifts to the left), unemployment and inflation increase simultaneously. This will correspond to a shift of the downward-sloping Phillips curve to the right. However, when people realize that actual inflation is less than expected inflation, then the downward-sloping Phillips curve starts to shift back and the economy adjusts back to the natural rate of unemployment in the long run.6.The expectations-augmented Phillips curve predicts that inflation will rise above the expected levelwhen unemployment drops below its natural rate. However, if people know that this is going to happen, why don’t they immediately adjust to it? And if people immediately adjusted to it, wouldn’t this imply that anticipated monetary policy would be ineffective to cause any deviation from the full-employment level of output? In reality, however, even if people have rational expectations, they may not be able to adjust immediately. One reason is that wage contracts often set wages for an extended time period. Similarly, prices cannot always be changed right away and the costs of changing prices may outweigh the benefits. A further argument is that even rational people make forecasting mistakes and learn only slowly.In other words, the location of the expectations-augmented Phillips curve is determined by the level of expected inflation, which is set by recent historical experience. A shift in this curve caused by changing inflationary expectations occurs only gradually. The rational expectations model, on the other hand, assumes that the Phillips curve shifts almost instantaneously as new information about the near future becomes available.Technical Problems:1. A reduction in the supply of money leads to excess demand for money and increased interest rates,reducing the level of private spending (especially investment). Therefore the AD-curve shifts to the left. This causes an excess supply of goods and services at the original price level so the price level starts to decrease. Since the AS-curve is upward sloping, a new short-run macro-equilibrium is reached at a lower level of output (and thus a higher level of unemployment) and a lower price level.PP1However, the higher level of unemployment eventually puts downward pressure on wages, reducing the cost of production and shifting the upward-sloping AS-curve to the right. Alternatively, since this equilibrium output level is below the full-employment level, prices will continue to fall, and the upward-sloping AS-curve will shift to the right. As long as output is below the full-employment level Y*, the upward-sloping AS-curve will continue to shift to the right, which means that the price level will continue to decline. Eventually a new long-run equilibrium will be reached at the full-employment level of output (Y*) and a lower price level.2. According to the rational expectations theory, an announced change in monetary policy wouldimmediately change people’s perception in regard to the expected inflation rate. If people could adjust immediately to this change in inflationary expectations, then the rate of unemployment or the output level would remain the same. In other words, we would immediately move from point 1 to point 3 in the diagram used to explain the previous question and the Fed would be unable to affect the unemployment rate. In reality, however, even if people have rational expectations and can anticipate the effects of a policy change correctly, they may not be able to immediately adjust due to wage contracts, etc. Thus, there will always be some deviation from the full-employment output level Y*.3.a. A favorable supply shock, such as a decline in material prices, shifts the upward-sloping AS-curve tothe right, leading to excess supply at the existing price level. A new short-run equilibrium is reached at a higher level of output and a lower price level. But since output is now above the full-employment level Y*, there is upward pressure on wages and prices and the upward-sloping AS-curve shifts back to the right. A new long-run equilibrium is reached back at the original position (Y*), and the original price level (assuming that the change in material prices did not affect the full-employment level of output). Since nominal wages (W) will have risen but the price level (P) will not have changed, real wages (W/P) will have increased.PP1P20 13.b. Lower material prices lower the cost of production, shifting the upward-sloping AS-curve shiftsto the right, and leading to an increase in output and a lower price level. Since unemployment is now below its natural rate, there is a shortage of labor, providing upward pressure on wages. This will increase the cost of production again, eventually shifting the upward-sloping AS-curve back to the original long-run equilibrium (assuming that potential GDP has not been affected).Additional Problems:1. Explain the long-run effect of an increase in nominal money supply on the amount of realmoney balances available in the economy.In the very short run, the price level is fixed, so if nominal money supply (M) increases, a higher level of real money balances is available, causing interest rates to fall and the level of investment spending to increase. This leads to an increase in aggregate demand. The shift to the right of the AD-curve causes the price level (P) to increase, leading to a reduction in real money balances (M/P). In the medium run (an upward-sloping AS-curve), we reach a new equilibrium at a higher output level and a higher price level. Since prices have gone up proportionally less than nominal money supply, real money balances have increased. However, to reach a new long-run equilibrium, prices have to increase further, and as a result, the level of real money balances will decrease further. When the new long-run equilibrium at Y* is finally reached, the price level will have risen proportionally to nominal money supply and the level of real money balances will be back at its original level.2. Assume the economy is in a recession. Describe an adjustment process that will ensure that theeconomy eventually will return to full employment. How can the government speed up this process?If the economy is in a recession, there will be downward pressure on wages and prices, which will bring the economy back to the full-employment output level. The upward-sloping AS-curve will shift to the right due to lower production costs. However, this process may take a fairly long time. The government can shorten this adjustment process with the help of expansionary fiscal or monetary policies to stimulate aggregate demand. The resulting shift to the right of the AD-curve implies that the final long-run equilibrium will be at a higher price level. In other words, the reduction in unemployment can only be achieved at the cost of higher inflation.3. "The stickiness of wages implies that policy makers can achieve low unemployment only if theyare willing to put up with high inflation." Comment on this statement.There are several explanations of why wages and prices adjust only slowly. One is that workers have imperfect information, so they do not realize that lower prices mean higher real wages. Another is that firms are reluctant to change prices and wages since they are unsure about the behavior of their competitors and want to avoid the perceived cost of making these changes. Finally, wage contracts tend to be long-term and staggered, so it takes time to adjust wages to price changes. Some firms may pay their workers above market-clearing wages to keep them happy and productive. For these reasons, wages and prices tend to be rigid in the short run. Thus it takes time for the economy to adjust back to full-employment.If there were a stable Phillips-curve relationship, a low rate of unemployment could only be achieved by allowing inflation to increase. However, such a stable relationship does not exist. Wages tend to be rigid in the short run, so expansionary policies lower unemployment and increase inflation in the short run. In the long run, however, the economy will adjust back to the natural rate of unemployment, so expansionary policies simply lead to a higher price level.4. "If we assume that people have rational expectations, then fiscal policy is always irrelevant.But monetary policy can still be used to affect the rate of inflation and unemployment."Comment on this statement.Individuals and firms with rational expectations consistently make optimal decisions based on all information available. As long as a policy change is anticipated, people are able to assess its long-run outcome and will try to immediately adjust. Since fiscal policy doesn't affect inflation or unemployment in the long run, it is also ineffective in the short run if wages and prices are assumed to be flexible. An anticipated change in monetary growth, on the other hand, will be reflected in a change in the inflation rate. If wages are flexible, workers will adjust their wage demands immediately and no significant change in the unemployment rate will occur. However, even if people have rational expectations, wages tend to be fairly rigid in the short run due to wage contracts. Therefore, it will take time for the economy to adjust back to a long-run equilibrium. This implies that both fiscal and monetary policy can affect the rate of inflation and unemployment to some degree in the short run.5. "Inflation cannot accelerate in a recession, when the rate of unemployment is above its naturalrate." Comment on this statement.Inflation can accelerate even in a recession, that is, when the unemployment is high, if a supply shock occurs. An oil price increase will increase the cost of production, so the upward-sloping AS-curve will shift to the left. This will increase the inflation rate and the rate of unemployment simultaneously, as firms increase their product prices and cut their production. If the Fed tries to accommodate the supply shock with expansionary monetary policy in an effort to stimulate the economy, then inflation will accelerate even more, as the AD-curve shifts to the right.6. Comment on the following statement:"The coordination approach to the Phillips curve focuses on the problems that the administration has in coordinating its fiscal policies with the monetary policies of the Fed." The coordination approach has nothing to do with fiscal or monetary policy but is simply one explanation of why wages adjust slowly. This view asserts that firms generally are unable to coordinate wage and price changes in response to a monetary policy change. For example, any firm that cuts workers' wages in response to monetary contraction while other firms don't, will anger its employees who may then choose to leave. Firms are also reluctant to change their prices since they are unsure about their competitors' behavior. Thus wages and prices change only slowly in response to a change in aggregate demand. This implies an upward-sloping (short-run) AS-curve.7. Comment on the following statement:"The unemployment rate is zero at the full-employment level of output."With a higher price level real wages decline, increasing the quantity of labor demanded. Therefore the nominal wage rate is bid up until the real wage rate is restored to its unique equilibrium level. Similarly, if prices fall, real wages increase, leading to unemployment. The nominal wage rate falls to bring the real wage rate back to its equilibrium level. So the nominal wage rate changes in proportion to the price level to maintain a real wage rate that clears the labor market. At this wage rate, the full-employment level of output is produced. However, at the full-employment output level the unemployment rate is not zero. Due to frictions in the labor market, there is always a positive unemployment rate, as workers switch between jobs. This is called the natural rate of unemployment.8. Briefly state the reason for the slow adjustment of wages to changes in aggregate demand. The reasons for the slow adjustment of nominal wages can be explained in several ways. One explanation is that workers have imperfect information, that is, they do not immediately realize whether a change in their nominal wage is the result of an increase in prices or in the real wage they receive for the work they provide. Another explanation is that coordination problems exist, that is, different firms within an economy are unsure about the behavior of their competitors and thus they only reluctantly change wages or prices. The efficiency wage theory, on the other hand, argues that firms pay above market-clearing wages to motivate their workers to work harder. Firms are also reluctant to change wages due to the perceived cost of doing so. Another argument is that wage contracts tend to be long-term, so real wages tend to fluctuate over the length of the contract and output adjusts only slowly to price changes. Finally, the insider-outsider model argues that firms negotiate only with their employees but not the unemployed. Since a turnover of the labor force is costly to firms, they are willing to offer above market-clearing wages to the currently employed rather than hiring the unemployed who may be willing to work for less. These various explanations are not mutually exclusive, and they all imply that the AS-curve is positively sloped, that is, that a change in aggregate demand will affect both output and prices in the short run.9. True or false? Why?"There is no frictional unemployment at the natural rate of unemployment."False. The natural rate of unemployment is the rate at which the labor market is in equilibrium. But there is always some unemployment due to new entrants into the labor force, people between jobs, and the like.This rate of unemployment is considered normal, due to frictions in the labor market, and is often called frictional unemployment.10. "If everyone in this economy had rational expectations, then wages would be flexible andunemployment could not occur." Comment on this statement.The new Keynesian models argue that even if people have rational expectations, socially undesirable outcomes may still occur due to imperfect competition and the existence of wage contracts. Prices may not change freely, since firms in imperfectly competitive markets are reluctant to change them, due to the menu costs involved. Nominal wages are set by contracts over a period of time, so the economy may adjust only slowly to a decrease in aggregate demand. Thus a rate of unemployment higher than the natural rate can exist over an extended period of time.11. True or false? Why?"If nominal wages were more flexible, expansionary policies would be more effective in reducing the rate of unemployment."False. In Chapter 5 we learned that in the classical case (where nominal wages are completely flexible) the AS-curve is vertical, whereas in the Keynesian case (where wages do not change, even if unemployment persists) the AS-curve is horizontal. From this we can conclude that more flexible nominal wages imply a steeper upward-sloping AS-curve. Any type of expansionary demand-side policy will shift the AD-curve to the right and this will cause the level of output and prices to increase (at least in the short-run). A steeper upward-sloping AS-curve results in a larger price increase and a smaller increase in output. But a smaller increase in the level of output results in a smaller reduction in unemployment. In either case, the economy will settle back at the full-employment level of output in the long run. In the long run, the rate of unemployment always goes back to its natural level.12. Explain the short-run and long-run effects of an increase in the level of government spendingon output, unemployment, interest rates, prices, and real money balances.An increase in government spending increases aggregate demand, shifting the AD-curve to the right. Because there is excess demand, the price level increases, which reduces the level of real money balances. Therefore interest rates increase, leading to some crowding out of investment. Due to this real balance effect, the increase in output is less than the shift in the AD-curve. Assuming an upward-sloping AS-curve, a new equilibrium is reached at a higher price level, a higher level of output, a lower unemployment rate and a higher interest rate. Since output is now above the full-employment level, wages and prices will continue to rise and the upward-sloping AS-curve will start shifting to the left. This process will continue until a new long-run equilibrium is reached at the full-employment level of income Y*, that is, until unemployment is back at its natural rate. At this point the price level, nominal wages, and interest rates will be higher than previously and real money balances will be lower.13. Briefly explain why there seems to be so much interest in finding ways to shift theupward-sloping aggregate supply curve to the right.Shifting the upward-sloping AS-curve to the right seems to be the only way to offset the effects of an adverse supply shock without any negative side effects. An adverse supply shock, such as an increase in oil prices, causes a simultaneous increase in unemployment and inflation, and policy makers have only two options for demand-management policies. Expansionary fiscal or monetary policy will help to achieve full employment faster but will raise the price level, while restrictive fiscal or monetary policy will reduce inflationary pressure but increase unemployment. Therefore, any policy that would shift the upward sloping AS-curve back to the right seems preferable, since it might bring the economy back to the original equilibrium by simultaneously lowering inflation and unemployment.14. Use an AD-AS framework to show the effect of monetary restriction on the level of output,prices and the interest rate in the medium and the long run.A decrease in nominal money supply will increase interest rates, leading to a decrease in investment spending. This will shift the AD-curve to the left, creating an excess supply of goods and services. Therefore price level will decrease and real money balances will increase. A new equilibrium will be achieved at the intersection of the new AD-curve and the upward-sloping AS-curve at an output level that is below the full-employment level.In the long run, higher unemployment will cause downward pressure on wages. As the cost of production decreases, the upward-sloping AS-curve will keep shifting to the right until a new long-run equilibrium is established at the full-employment level of output, that is, where the new AD-curve intersects the long-run vertical AS-curve at Y*. At this point, real output, the real interest rate, real money balances, and the real wage rate will be back at their original level. Nominal money supply, the price level and the nominal wage rate will all have decreased proportionally.A simplified adjustment can be shown as follows:1-->2: Ms down ==> i up ==> I down ==> Y down ==> the AD-curve shifts left ==>excess supply ==> P down ==> real ms up ==> i down ==> I up ==> Y up(The first line describes a policy change, that is, a shift in the AD-curve; the second line describes the price adjustment, that is, a movement along the AD-curve.)Short-run effect:Y down, i up, P down2-->3: Since Y < Y* ==> downwards pressure on nominal wages ==> cost of production down ==> the short run AS-curve shifts right ==> excess supply of goods ==> P down ==> real ms up==> i down ==> I up ==> Y up (This process continues until Y = Y*)Long-run effect:Y stays at Y*, i remains the same, P down.Note: Even though only one shift of the short-run AS-curve to the new long-run equilibrium is shown here, this shift is actually a combination of many shifts.P2P1P2P30 215. Briefly discuss the importance of Okun’s law in evaluating the cost of unemployment.Okun’s law states that a reduction in the unemployment rate of 1 percent will increase the level of output by about 2 percent. This relationship allows us to measure the cost to society (in terms of lost production) of a given rate of unemployment.16. True or false? Why?"If monetary policy accommodates an adverse supply shock, it will worsen any inflationary effects."True. An adverse supply shock shifts the upward-sloping AS-curve to the left. There is excess demand for goods and services at the original price level and prices start to rise, leading to lower real money balances, higher interest rates, and lower output. If no policy is implemented, then unemployment will force the nominal wage down to restore equilibrium at the original position. If the government views this adjustment process as too slow, it can respond by implementing expansionary policies. Accommodating the supply shock in this way shifts the AD-curve to the right and a new equilibrium can be reached at full-employment but at a higher price level. It is unlikely, though, that the economy will remain there for long since workers will realize that their purchasing power has been diminished by higher prices and will demand a wage increase. If they are successful, the cost of production will increase and the upward-sloping AS-curve will shift to the left again. In other words, we will enter a wage-price spiral.PP3P2P1217. Assume oil prices decline. What kind of monetary policy should the Fed undertake if its goal isto stabilize the level of output while keeping inflation low? Show with the help of an AD-AS diagram and briefly explain the adjustment process.1-->2: As oil prices decline, the cost of production decreases and the upward-sloping AS-curve shifts to the right, causing excess supply of goods. Thus the price level decreases, real money balances increase, and the interest rate declines.2-->3: A decrease in money supply will increase the interest rate, decrease private spending, and shift the AD-curve to the left. This means that prices will decrease even further and the level of output will decline. (We assume, for simplicity, that it goes back to the full-employment level Y*, so no long-run adjustment is needed.) Overall, the level of output has remained at its full-employment level but the level of prices and the interest rate have decreased.PP1P2218. Comment on the following statement:"A favorable oil shock causes lower inflation and lower unemployment."A decrease in material prices (or any other favorable supply shock) shifts theupward-sloping AS-curve to the right, and prices begin to decrease. The new equilibrium is at a lower price level and a higher level of output (a lower level of unemployment).Since output is now above the full-employment level, there will be upward pressure on nominal wages and prices, and the upward-sloping AS-curve will start shifting back to its original position (assuming that potential output was not affected). In the long run, unemployment will be back at its natural rate but the price level will have decreased (and thus real wages increased).19. “Falling oil prices will lead to increased employment, higher wage rates an dincreased real money balances.” Comment on this statement with the help of an AD-AS diagram and explain the short-run and long-run adjustment processes.A decline in material prices shifts the upward-sloping AS-curve to the right, leading to excess supply at the existing price level. A new equilibrium is reached at a higher level of output and a lower price level. But since output is now above the full-employment level Y*, there is upward pressure on wages and prices and the upward-sloping AS-curve starts shifting back to the right. A new long-run equilibrium is reached back at the original position (Y*), and the original price level (assuming that the change in material prices did not affect the full-employment level of output). Since nominal wages (W) will have risen but the price level (P) will not have changed, real wages (W/P) will have increased.PP1P2Y*Y2Y。
10宏观经济学英文版(多恩布什)课后习题答案全解
CHAPTER 10MONEY, INTEREST, AND INCOMEAnswers to Problems in the Textbook:Conceptual Problems:1. The model in Chapter 9 assumed that both the price level and the interest rate were fixed. But the IS-LM model lets the interest rate fluctuate and determines the combination of output demanded and the interest rate for a fixed price level. It should be noted that while the upward-sloping AD-curve in Chapter 9 (the [C+I+G+NX]-line in the Keynesian cross diagram) assumed that interest rates and prices were fixed, the downward-sloping AD-curve that is derived at the end of Chapter 10 from the IS-LM model lets the price level fluctuate and describes all combinations of the price level and the level of output demanded at which the goods and money sector simultaneously are in equilibrium. 2.a. If the expenditure multiplier (α) becomes larger, the increase in equilibrium income caused by a unitchange in intended spending also becomes larger. Assume investment spending increases due to a change in the interest rate. If the multiplier α becomes larger, any increase in spending will cause a larger increase in equilibrium income. This means that the IS-curve will become flatter as the size of the expenditure multiplier becomes larger.If aggregate demand becomes more sensitive to interest rates, any change in the interest rate causes the [C+I+G+NX]-line to shift up by a larger amount and, given a certain size of the expenditure multiplier α, this will increase equilibrium income by a larger amount. As a result, the IS-curve will become flatter.2.b. Monetary policy changes affect interest rates and this leads to a change in intended spending, whichis reflected in a change in income. In 2.a. it was explained that a steep IS-curve means either that the multiplier α is small or that desired spending is not very interest sensitive. Therefore, an increase in money supply will reduce interest rates. However, this does not result in a large increase in aggregate demand if spending is very interest insensitive. Similarly, if the multiplier is small, then any change in spending will not affect output significantly. Therefore, the steeper the IS-curve, the weaker the effect of monetary policy changes on equilibrium output.3. Assume that money supply is fixed. Any increase in income will increase money demand and theresulting excess demand for money will drive the interest rate up. This, in turn, will reduce the quantity of money balances demanded to bring the money sector back to equilibrium. But if money demand is very interest insensitive, then a larger increase in the interest rate is needed to reach a new equilibrium in the money sector. As a result, the LM-curve becomes steeper.Along the LM-curve, an increase in the interest rate is always associated with an increase in income. This means that an increase in money demand (due to an increase in income) has to be offset by a decrease in the quantity of money demanded (due to an increase in the interest rate) to keep the money sector in equilibrium. But if money demand becomes more income sensitive, a smaller change in income is required for any specific change in the interest rate to keep the money sector in equilibrium. Therefore, the LM-curve becomes steeper as money demand becomes more income sensitive.4.a. A horizontal LM-curve implies that the public is willing to hold whatever money is supplied at anygiven interest rate. Therefore, changes in income will not affect the equilibrium interest rate in the money sector. But if the interest rate is fixed, we are back to the analysis of the simple Keynesian model used in Chapter 9. In other words, there is no offsetting effect (or crowding-out effect) to fiscal policy.14.b. A horizontal LM-curve implies that changes in income do not affect interest rates in the money sector.Therefore, if expansionary fiscal policy is implemented, the IS-curve shifts to the right, but the level of investment spending is no longer negatively affected by rising interest rates, that is, there is no crowding-out effect. In terms of Figure 10-3, the interest rate not longer serves as the link between the goods and assets markets.4.c. A horizontal LM-curve results if the public is willing to hold whatever money balances are suppliedat a given interest rate. This situation is called the liquidity trap. Similarly, if the Fed is prepared to peg the interest rate at a certain level, then any change in income will be accompanied by an appropriate change in money supply. This will lead to continuous shifts in the LM-curve, which is equivalent to having a horizontal LM-curve, since the interest rate will never change.5. From the material presented in the text we know that when intended spending becomes more interestsensitive, then the IS-curve becomes flatter. Now assume that an increase in the interest rate stimulates saving and therefore reduces the level of consumption. This means that now not only investment spending but also consumption is negatively affected by an increase in the interest rate. In other words, the [C+I+G+NX]-line in the Keynesian cross diagram will now shift down further than previously and the level of equilibrium income will decrease more than before. In other words, the IS-curve has become flatter.This can also be shown algebraically, since we can now write the consumption function as follows:C = C* + cYD - giIn a simple model of the expenditure sector without income taxes, the equation for aggregate demand will now beAD = A o + cY - (b + g)i.From Y = AD ==> Y = [1/(1 - c)][A o - (b + g)i] ==>i = [1/(b + g)]A o - [(1 - c)/(b + g)]YTherefore, the slope of the IS-curve has been reduced from (1 - c)/b to (1 - c)/(b + g).6. In the IS-LM model, a simultaneous decline in interest rates and income can only be caused by a shiftof the IS-curve to the left. This shift in the IS-curve could have been caused by a decrease in private spending due to negative business expectations or a decline in consumer confidence. In 1991, the economy was in a recession and firms did not want to invest in new machinery and, since consumer confidence was very low, people were not expected to increase their level of spending. In the IS-LM diagram the adjustment process can be described as follows:I o↓ ==> Y ↓ (the IS-curve shifts left) ==> m d↓ ==> i ↓ ==> I ↑ ==> Y ↑. Effect: Y ↓ and i ↓ .2ii1i221Technical Problems:1.a. Each point on the IS-curve represents an equilibrium in the expenditure sector. Therefore the IS-curvecan be derived by settingY = C + I + G = (0.8)[1 - (0.25)]Y + 900 - 50i + 800 = 1,700 + (0.6)Y - 50i ==>(0.4)Y = 1,700 - 50i ==> Y = (2.5)(1,700 - 50i) ==> Y = 4,250 - 125i.1.b. The IS-curve shows all combinations of the interest rate and the level of output such that theexpenditure sector (the goods market) is in equilibrium, that is, intended spending is equal to actual output. A decrease in the interest rate stimulates investment spending, making intended spending greater than actual output. The resulting unintended inventory decrease leads firms to increase their production to the point where actual output is again equal to intended spending. This means that the IS-curve is downward sloping.1.c. Each point on the LM-curve represents an equilibrium in the money sector. Therefore the LM-curvecan be derived by setting real money supply equal to real money demand, that is,M/P = L ==> 500 = (0.25)Y - 62.5i ==> Y = 4(500 + 62.5i) ==> Y = 2,000 + 250i.1.d. The LM-curve shows all combinations of the interest rate and level of output such that the moneysector is in equilibrium, that is, the demand for real money balances is equal to the supply of real money balances. An increase in income will increase the demand for real money balances. Given a fixed real money supply, this will lead to an increase in interest rates, which will then reduce the quantity of real money balances demanded until the money market clears. In other words, the LM-curve is upward sloping.1.e. The level of income (Y) and the interest rate (i) at the equilibrium are determined by the intersectionof the IS-curve with the LM-curve. At this point, the expenditure sector and the money sector are both in equilibrium simultaneously.From IS = LM ==> 4,250 - 125i = 2,000 + 250i ==> 2,250 = 375I ==> i = 6==> Y = 4,250 - 125*6 = 4,250 - 750 ==> Y = 3,500Check: Y = 2,000 + 250*6 = 2,000 + 1,500 = 3,5003i125 ISLM62,000 3,500 4,250 Y2.a. As we have seen in 1.a., the value of the expenditure multiplier is α= 2.5. This multiplier αisderived in the same way as in Chapter 9. But now intended spending also depends on the interest rate, so we no longer have Y = αA o, but ratherY = α(A o - bi) = (1/[1 - c + ct])(A o - bi) ==> Y = (2.5)(1,700 - 50i) = 4,250 - 125i.2.b.This can be answered most easily with a numerical example. Assume that government purchasesincrease by ∆G = 300. The IS-curve shifts parallel to the right by==> ∆IS = (2.5)(300) = 750.Therefore IS': Y = 5,000 - 125iFrom IS' = LM ==> 5,000 - 125i = 2,000 + 250i ==> 375i = 3,000 ==> i = 8==> Y = 2,000 + 250*8 ==> Y = 4,000 ==> ∆Y = 500When interest rates are assumed to be constant, the size of the multiplier is equal to α = 2.5, that is, (∆Y)/(∆G) = 750/300 = 2.5. But when interest rates are allowed to vary, the size of the multiplier is reduced to α1 = (∆Y)/(∆G) = 500/300 = 1.67.2.c. Since an increase in government purchases by ∆G = 300 causes a change in the interest rate of 2percentage points, government spending has to change by ∆G = 150 to increase the interest rate by 1 percentage point.2.d. The simple multiplier α in 2.a. shows the magnitude of the horizontal shift in the IS-curve, given achange in autonomous spending by one unit. But an increase in income increases money demand and the interest rate. The increase in the interest rate crowds out some investment spending and this has a dampening effect on income. The multiplier effect in 2.b. is therefore smaller than the multiplier effect in 2.a.3.a. An increase in the income tax rate (t) will reduce the size of the expenditure multiplier (α). But as themultiplier becomes smaller, the IS-curve becomes steeper. As we can see from the equation for the IS-curve, this is not a parallel shift but rather a rotation around the vertical intercept.Y = α(A o - bi) = [1/(1 - c + ct)](A o - bi) ==> i = (1/b)A o - (α/b)Y = (1/b)A o - (1/b)[1 - c + ct]Y 3.b. If the IS-curve shifts to the left and becomes steeper, the equilibrium income level will decrease. Ahigher tax rate reduces private spending and this will lower national income.3.c. When the income tax rate is increased, the equilibrium interest rate will also decrease. The adjustmentto the new equilibrium can be expressed as follows (see graph on the next page):t up ==> C down ==> Y down ==> m d down ==> i down ==> I up ==> Y up. Effect: Y ↓ and i ↓45i 1i 2214.a. If money demand is less interest sensitive, then the LM-curve is steeper and monetary policy changesaffect equilibrium income to a larger degree. If money supply is assumed to be fixed, the adjustment to a new equilibrium in the money sector has to come solely through changes in money demand. If money demand is less interest sensitive, any increase in money supply requires a larger increase in income and a larger decrease in the interest rate in order to bring the money sector into a new equilibrium.i ii 1 i 1 2 2i 20 120 12The adjustment process in each of the two diagrams is the same; however, in the case of a more interest-sensitive money demand (a flatter LM-curve), the change in Y and i will be smaller.(M/P) up ==> i down ==> I up ==> Y up ==> m d up ==> i up Effect: Y ↑ and i ↓Section 10-5 derives the equation for the LM-curve and the equation for the monetary policy multiplier asi = (1/h)[kY - (M/P)] and (∆Y)/∆(M/P) = (b/h)γrespectively. If money demand becomes more interest sensitive, the value of h becomes larger and the slope of the LM-curve becomes flatter, while the size of the monetary policy multiplier becomes smaller.4.b. An increase in money supply drives interest rates down. This decrease in interest rates will stimulateintended spending and thus income. If money demand becomes less interest sensitive, a larger increase in income is required to bring the money sector into equilibrium. But this implies that the overall decrease in the interest rate has to be larger, given that the interest sensitivity of spending has not changed.5. The price adjustment, that is, the movement along the AD-curve, can be explained in the followingway: With nominal money supply (M) fixed, real money balances (M/P) will decrease as the price level (P) increases. There is an excess demand for money and interest rates will rise. This will lead toa decrease in investment spending and thus the level of output demanded will decrease. In otherwords, the LM-curve will shift to the left as real money balances decrease.6. In the classical case, the AS-curve is vertical. Therefore, any increase in aggregate demand due toexpansionary monetary policy will, in the long run, not lead to any increase in output but simply lead to an increase in the price level. An increase in money supply will first shift the LM-curve to the right.This implies a shift of the AD-curve to the right. Therefore we have excess demand for goods and services and prices will begin to rise. But as the price level rises, real money balances will begin to fall again, eventually returning to their original level. Therefore, the shift of the LM-curve to the right due to the expansionary monetary policy and the resulting shift of the AD-curve will be exactly offset by a shift of the LM-curve to the left and a movement along the AD-curve to the new long-run equilibrium due to the price adjustment. At this new long-run equilibrium, the level of output and interest rates will not have changed while the price level will have changed proportionally to the nominal money supply, leaving real money balances unchanged. In other words, money is neutral in the long run (the classical case).7.a. An increase in the demand for money will shift the LM-curve to the left, raising the interest rate andlowering the level of output demanded. As a result, the AD-curve will also shift to the left. In the Keynesian case, the price level is assumed to be fixed, that is, the AS-curve is horizontal. In this case, the decrease in income in the AD-AS diagram is equivalent to the decrease in income in the IS-LM diagram, since there is no price adjustment, that is, the real balance effect does not come into play. 7.b. An increase in the demand for money will shift the LM-curve to the left, raising the interest rate andlowering the level of output demanded. As a result, the AD-curve will also shift to the left. In the classical case, the level of output will not change, since the AS-curve is vertical. In this case, the shift in the AD-curve will simply be reflected in a price decrease, but the level of output will remain unchanged. The real balance effect causes the LM-curve to shift back to its original level, since the price decrease causes an increase in real money balances.Additional Problems:1. True or false? Explain your answer.“A decrease in the marginal propensity to save implies tha t the IS-curve will become steeper.”False A decrease in the marginal propensity to save (s = 1 - c) is equivalent to an increase in the marginal propensity to consume (c), which, in turn, implies an increase in the expenditure multiplier ( ). But with a larger expenditure multiplier, any increase in investment spending due to a decrease in the interest rate will lead to a larger increase in income. Therefore the IS-curve will become flatter and not steeper.2. True or false? Explain your answer.“If the c entral bank keeps the supply of money constant, then the money supply curve is vertical, which implies a vertical LM-curve.”6False. Equilibrium in the money sector implies that real money supply is equal to real money demand, that is,m s = M/P = m d(i,Y).This implies that any increase in income (Y) will increase the demand for money. To bring the money sector back into equilibrium, interest rates (i) have to rise simultaneously to bring the quantity of money demanded back to the original level (equal to the fixed supply of money). Therefore, to keep the money sector in equilibrium, an increase in income must always be associated with an increase in the interest rate and the LM-curve must be upward sloping.3. "Restrictive monetary policy reduces consumption and investment." Comment on thisstatement.A reduction in money supply raises interest rates, which will, in turn, have a negative effect on the level of investment spending. The level of consumption may also decrease as it becomes more costly to finance expenditures by borrowing money. But even if it is assumed that consumption is not affected by changes in the interest rate, consumption will still decrease since restrictive monetary policy will reduce national income and therefore private spending.4. "If government spending is increased, money demand will increase." Comment.A change in government spending directly affects the expenditure sector and therefore the IS-curve. But in an IS-LM framework, the money sector is also affected indirectly. An increase in the level of government spending will shift the IS-curve to the right, leading to an increase in income. But the increase in income will lead to an increase in money demand, so the interest rate will have to increase in order to lower the quantity of money demanded and to bring the money sector back into equilibrium. Overall no change in money demand can occur, since equilibrium in the money sector requires that m s = M/P = m d, that is, money supply has to be equal to money demand, and money supply is assumed to be fixed.5. "An increase in autonomous investment reduces the interest rate and therefore the moneysector will no longer be in equilibrium." Comment on this statement.An increase in autonomous investment shifts the IS-curve to the right. The increase in income leads to an increase in the demand for money, which means that interest rates increase. The increase in interest rates then reduces the quantity of money demanded again to bring the money market back to equilibrium.6. "A monetary expansion leaves the budget surplus unaffected." Comment on this statement. Expansionary monetary policy, that is, an increase in money supply, will lower interest rates (the LM-curve will shift to the right). Lower interest rates will lead to an increase in investment spending and the economy will therefore be stimulated. But a higher level of national income increases the government’s tax revenues and therefore the budget surplus will increase.7. "Restrictive monetary policy implies lower tax revenues and therefore to an increase in thebudget deficit." Comment on this statement.A decrease in money supply will shift the LM-curve to the left. This will lead to an increase in the interest rate, which will lead to a reduction in spending and thus national income. But as income decreases, so does income tax revenue. Therefore, the budget deficit will increase because of the change in its cyclical component.78. “If the demand for money becomes more sensitive to changes in income, then the LM-curvebecome s flatter.” Comment on this statement.Along the LM-curve, an increase in the interest rate is always associated with an increase in income. This means that an increase in money demand (due to an increase in income) has to be offset by a decrease in the quantity of money demanded (due to an increase in the interest rate) to keep the money sector in equilibrium. But if money demand becomes more income sensitive, a smaller change in income is required for any specific change in the interest rate to keep the money sector in equilibrium. Therefore, the LM-curve becomes steeper (and not flatter) as money demand becomes more sensitive to changes in income.9. “A decrease in the income tax rate will increase the demand for money, shifting the LM-curveto the righ t.” Comment on this statement.A decrease in the income tax rate (t) will increase the expenditure multiplier (α). But with a larger expenditure multiplier, any increase in investment spending due to a decrease in the interest rate will lead to a larger increase in income. Since fiscal policy affects the expenditure sector, the IS-curve (not the LM-curve) will shift. The IS-curve will become flatter and shift to the right. This will lead to a new equilibrium at a higher level of income (Y) and a higher interest rate (i). But money supply is fixed and the LM-curve remains unaffected by fiscal policy. Therefore, at the new equilibrium (the intersection of the new IS-curve with the old LM-curve) the demand for money will not have changed, since the money sector has to be in an equilibrium at m s = m d(i,Y).10. “If the demand for money becomes more insensitive to changes in the interest rate, equilibriumin the money sector will have to be restored mostly through changes in income. This implies a flat LM-curve.” Comment on this statement.Any increase in income will increase money demand and this will drive the interest rate up. Therefore, the quantity of money balances demanded will decline again until the money sector is back in equilibrium. But if money demand is very interest insensitive, then a larger increase in the interest rate is needed to reach a new equilibrium in the money sector. This means that the LM-curve is steep and not flat.11. Assume the following IS-LM model:Expenditure Sector Money SectorSp = C + I + G + NX M = 700C = 100 + (4/5)YD P = 2YD = Y - TA m d = (1/3)Y + 200 - 10iTA = (1/4)YI = 300 - 20iG = 120NX = -20(a) Derive the equilibrium values of consumption (C) and money demand (m d).(b) How much of investment (I) will be crowded out if the government increases its purchasesby ∆G = 160 and nominal money supply (M) remains unchanged?(c) By how much will the equilibrium level of income (Y) and the interest rate (i) change, ifnominal money supply is also increased to M' = 1,100?a. Sp = 100 + (4/5)[Y - (1/4)Y] + 300 - 20i + 120 - 20 = 500 + (4/5)(3/4)Y – 20i = 500 + (3/5)Y - 20iFrom Y = Sp ==> Y = 500 + (3/5)Y - 20i ==> (2/5)Y = 500 - 20i==> Y = (2.5)(500 - 20i) ==> Y = 1,250 - 50i IS-curveFrom M/P = m d ==> 700/2 = (1/3)Y + 200 - 10i ==> (1/3)Y = 150 + 10i==> Y = 3(150 + 10i) ==> Y = 450 + 30i LM-curve89IS = LM ==> 1,250 - 50i = 450 + 30i ==> 800 = 80i ==> i = 10==> Y = 1,250 - 50*10 ==> Y = 750C = 100 + (4/5)(3/4)750 = 100 + (3/5)750 ==> C = 550m s = M/P = 700/2 = 350 = m dCheck: m d = (1/3)750 + 200 - 10*10 = 350i25 IS o LM o10450 750 1,250 Yb. ∆IS = (2.5)160 = 400 ==> IS' = 1,650 - 50iIS' = LM ==> 1,650 - 50i = 450 + 30i ==> 1,200 = 80i ==> i = 15==> Y = 1,650 - 50*15 ==> Y = 900Since ∆i = + 5 ==> ∆I = - 20*5 ==> ∆I = - 100Check: ∆ 331510450 750 900 1,250 1,650 Yc. From M'/P = m d ==> 1,100/2 = (1/3)Y + 200 - 20i==> (1/3)Y = 350 - 20i ==> Y = 3(350 - 20i) ==> Y = 1,050 + 30iIS 1 = LM 1 ==> 1,650 - 50i = 1,050 + 30i ==> 600 = 80i ==> i = 7.5==> Y = 1,650 - 50(7.5) = 1,275.==> ∆i = - 7.5 and ∆Y = 375 as compared to (b).i1107.512. Assume the money sector can be described by these equations: M/P = 400 and m d = (1/4)Y - 10i.In the expenditure sector only investment spending (I) is affected by the interest rate (i), and the equation of the IS-curve is: Y = 2,000 - 40i.(a) If the size of the expenditure multiplier is α= 2, show the effect of an increase ingovernment purchases by ∆G = 200 on income and the interest rate.(b) Can you determine how much of investment is crowded out as a result of this increase ingovernment spending?(c)If the money demand equation were changed to m d = (1/4)Y, how would your answers in (a)and (b) change?a. From M/P = m d ==> 400 = (1/4)Y - 10i ==> Y = 1,600 + 40i LM-curveFrom IS = LM ==> 2,000 - 40i = 1,600 + 40i ==> 80i = 400 ==> i = 5==> Y = 2,000 - 40*5 ==> Y = 1,800∆IS = 2*200 = 400 ==> IS' = 2,400 - 40iIS' = LM ==> 2,400 - 40i = 1,600 + 40i ==> 80i = 800 ==> i = 10==> Y = 1,600 + 40*10 ==> Y = 2,000Therefore ∆i = + 5 and ∆Y = + 200b.Since the size of the expenditure multiplier is α = 2 but income only goes up by αY = 200, the fiscalpolicy multiplier in the IS-LM model is α1= 1. But this means that the level of investment has been reduced by 100, that is, ∆I = -100. This can be seen by restating the IS-curve as follows:Y = 2,000 - 40i = Y = 2(1,000 - 20i)Since government purchases are changed by ∆G = 200 ==> Y = 2(1,200 - 20i), which means that the IS-curve shifts by ∆IS = 2*200 = 400. But the increase in income is actually only ∆Y = 200. This implies that investment changes by ∆I = -100. Investment is of the form I = I o– 20i; however, since the interest rate went up by ∆i = 5, investment changes by ∆I = - 20*5 = - 100.From ∆Y = α(∆Sp) ==> 200 = 2(∆Sp) ==> ∆Sp = 100But since ∆Sp =∆ G + ∆I ==> 100 = 200 + ∆I ==> ∆I = - 100c. If m d= (1/4)Y, then we have the classical case, that is, a vertical LM-curve. In this case, fiscalexpansion will not change income at all. This occurs since the increase in G will be offset by a decrease in I of equal magnitude due to an increase in the interest rate.(M/P) = m d ==> 400 = (1/4)Y ==> Y = 1,600 LM-curveIS = LM ==> 2,000 - 40i = 1,600 ==> 40i = 400 ==> i = 10 ==> Y = 1,600IS' = LM ==> 2,400 - 40i = 1,600 ==> 40i = 800==> i = 20 ==> Y = 1,600 ==> ∆I = - 2001013. Assume money demand (md) and money supply (ms) are defined as: md = (1/4)Y + 400 - 15iand ms = 600, and intended spending is of the form: Sp = C + I + G + NX = 400 + (3/4)Y - 10i.Calculate the equilibrium levels of Y and i, and indicate by how much the Fed would have to change money supply to keep interest rates constant if the government increased its spending by ∆G = 50. Show your solutions graphically and mathematically.ms = md ==> 600 = (1/4)Y + 400 - 15i ==> (1/4)Y = 200 + 15i==> Y = 4(200 + 15i) ==> Y = 800 + 60i LM-curveY = C + I + G + NX ==> Y = 400 + (3/4)Y - 10i ==>(1/4)Y = 400 - 10i ==> Y = 4(400 - 10i) ==> Y = 1,600 - 40i IS-curveFrom IS = LM ==> 1,600 - 40i = 800 + 60i ==> 100i = 800 ==> i = 8 ==> Y = 1,280If government spending is increased by ∆G = 50, the IS-curve will shift to the right) by (∆IS) = 4*50 = 200. If the Fed wants to keep the interest rate constant, money supply has to be increased in a way that shifts the LM-curve to the right by exactly the same amount as the IS-curve, that is, (∆LM) = 200.From Y = 2(200 + 15i) ==> (∆Y) = 2(∆ms) ==> 200 = 2(∆ms)==> (∆ms) = 100, so money supply has to be increased by 100.Check: IS' = LM": 1,800 - 40i = 1,000 + 60i ==> 800 = 100i4018800 1000 1280 1480 1600 1800 Y14. Assume the equation for the IS-curve is Y = 1,200 – 40i, and the equation for the LM-curve isY = 400 + 40i.(a) Determine the equilibrium value of Y and i.(b) If this is a simple model without income taxes, by how much will these values change if thegovernment increases its expenditures by ∆G = 400, financed by an equal increase in lump sum taxes (∆TA o = 400)?a. From IS = LM ==> 1,200 - 40i = 400 + 40i ==>800 = 80i ==> i = 10 ==> Y = 400 + 40*10 ==> Y = 800b. According to the balanced budget theorem, the IS-curve will shift horizontally by the increase ingovernment purchases, that is, ∆IS = ∆G = ∆TA o = 400.Thus the new IS-curve is of the form: Y = 1,600 - 40i.From IS' = LM ==> 1,600 - 40i = 400 + 40i ==>1,200 = 80i ==> i = 15 ==> Y = 400 + 40*15 ==> Y = 1,00015. Assume you have the following information about a macro model:Expenditure sector: Money sector:11。
多恩布什<宏观经济学>第八版第五章英文答案
Chapter 5 Solutions to the Problems in the Textbook Conceptual Problems:1. The aggregate supply curve shows the quantity of real total output that firms arewilling to supply at each price level. The aggregate demand curve shows all combinations of real total output and the price level at which the goods and the money sectors are simultaneously in equilibrium. Along the AD-curve nominal money supply is assumed to be constant and no fiscal policy change takes place.2. The classical aggregate supply curve is vertical, since the classical model assumes thatnominal wages adjust very quickly to changes in the price level. This implies that the labor market is always in equilibrium and output is always at the full-employment level.If the AD-curve shifts to the right, firms try to increase output by hiring more workers, who they try to attract by offering higher nominal wages. But since we are already at full employment, no more workers can be hired and firms merely bid up nominal wages. The nominal wage increase is passed on in the form of higher product prices. In the end, the level of wages and prices will have increased proportionally, while the real wage rate and the levels of employment and output will remain unchanged.If there is a decrease in demand, then firms try to lay off workers. Workers, in turn, are willing to accept lower wages to stay employed. Lower wage costs enable firms to lower their product prices. In the end, nominal wages and prices will decrease proportionally but the real wage rate and the level of employment and output will remain the same.3. There is no single theory of the aggregate supply curve, which shows the relationshipbetween firms' output and the price level. A number of competing explanations exist for the fact that firms have a tendency to increase their output level as the price level increases. The Keynesian model of a horizontal aggregate supply curve supposedly describes the very short run (over a period of a few months or less), while the classical model of a vertical aggregate supply curve is supposed to hold true for the long run (a period of more than 10 years). The medium-run aggregate supply curve is most useful for periods of several quarters or a few years. This upward-sloping aggregate supply curve results from the fact that wage and price adjustments are slow and uncoordinated. Chapter6 offers several explanations for the fact that labor markets do not adjust quickly. Theseinclude the imperfect information market-clearing model, the existence of wage contracts or coordination problems, and the fact that firms pay efficiency wages and price changes tend to be costly.4. The Keynesian aggregate supply curve is horizontal since the price level is assumed to befixed. It is most appropriate for the very short run (a period of a few months or less). Theclassical aggregate supply curve is vertical and output is assumed to be fixed at its potential level. It is most appropriate for the long run (a period of more than 10 years) when prices are able to fully adjust to all shocks.5. The aggregate supply and aggregate demand model used in macroeconomics is notvery similar to the market demand and market supply model used in microeconomics.While the workings of both models (the distinction between shifts of the curves versus movement along the curves) are similar, these models are really unrelated. The "P" in the microeconomic model stands for the relative price of a good (or the ratio at which two goods are traded), whereas the "P" in the macroeconomic model stands for the average price level of all goods and services produced in this country, measured in money terms.Technical Problems:1.a. As Figure 5-9 in the text shows, a decrease in income taxes will shift both the AD-curveand the AS-curve to the right. The shift in the AD-curve tends to be fairly large and, in the short run (when prices are fixed), leads to a significant increase in output without a change in prices. In the long run, the AS-curve will also shift to the right--since lower income tax rates provide an incentive to work more--but only by a fairly small amount.Therefore we see a slightly higher real GDP with a large increase in the price level in the long run.1.b. Supply-side economics is any policy measure that will increase potential GDP by shiftingthe long-run (vertical) AS-curve to the right. In the early 1980s, supply-side economists put forth the view that a cut in income tax rates would increase the incentive to work, save and invest. This would increase aggregate supply so much that the inflation and unemployment rates would simultaneously decrease. The resulting high economic growth might then even lead to an increase in tax revenues, despite lower tax rates. However, these predictions did not become reality. As seen in the answer to 2.a., the long-run effect of a tax cut on output is not very large, although it can increase long-term output to some degree.2.a. According to the balanced budget theorem, a simultaneous and equal increase ingovernment purchases and taxes will shift the AD-curve to the right. But if the AS-curve is upward sloping, then the balanced budget multiplier will be less than one, that is, the increase in output will be less than the increase in government expenditures. This occurs, since part of the increase in government spending will be crowded out due a higher price level, lower real money balances, and a resulting rise in interest rates.P ADP oPY o Y1Y2.b. In the Keynesian case, the AS-curve is horizontal and the price level remains unchanged.There is no real balance effect and therefore income will increase more than in 3.a.However, the interest rate will still increase and therefore the balanced budget multiplier will be less than one (but greater than zero).PP o0 Y o Y1Y2.c. In the classical case, the AS-curve is vertical and the output level remains unchanged. Inthis case, a shift in the AD-curve leads to a price increase and real money balances decline. Therefore interest rates increase further than in 3.b., leading to full crowding out of investment. Hence the balanced budget multiplier is zero.PP1P0Y* YAdditional Problems1. Briefly explain why the AS-curve is upward sloping in the intermediate run?An upward-sloping AS-curve assumes that wage and price adjustments are slow and uncoordinated. This can be explained most easily by the existence of wage contracts and imperfect competition. Because of wage contracts, wages cannot be changed easily and, since the contracts tend to be staggered, they cannot be changed all at once. In an imperfectly competitive market structure, firms are reluctant to change their prices since they cannot accurately predict the reactions of their competitors. Therefore, wages and prices will adjust only slowly. (Chapter 6 provides more elaborate explanations for this.)2. Briefly discuss in words why the AD-curve is downward sloping.In the AD-AS framework, we assume that nominal money supply (M) is constant unless it is changed by the Fed's monetary policy (which would result in a shift in the AD-curve). Therefore, if the price level increases, then real money (M/P) decreases, driving interest rates (i) up and lowering the level of investment spending (I). This means that total output demanded (Y) will decrease.A more elaborate answer may include that lower real money balances (M/P) result in less real wealth, leading to a lower level of consumption (C) due to the wealth effect. This means that total output demanded (Y) will decrease. A higher domestic price level (P) also means that domestic goods will become less competitive in world markets. This will stimulate imports while reducing exports, leading to a reduction in net exports (NX), and a decrease in total output demanded (Y).3. "In the classical aggregate supply curve model, the economy is always at thefull-employment level of output and the unemployment rate is always zero."Comment on this statement.The classical aggregate supply curve model implies a vertical AS-curve at the full-employment level of output. However, this does not mean that the unemployment rate is zero. There is always some friction in the labor market, which means that there is always some (frictional) unemployment as workers switch jobs. The (positive) amount of unemployment at the full-employment level of output is called the natural rate of unemployment and is estimated to be roughly 5.5 percent for the United States; however, anexact value for this natural rate has not been established.4. Assume a technological advance leads to lower production costs. Show the effect ofsuch an event on national income, unemployment, inflation, and interest rates with the help of an AD-AS diagram, assuming completely flexible wage rates.A decrease in production costs shifts the AS-curve to the right. The price level decreases, leading to a higher level of income and lower interest rates. Since wages are completely flexible, the AS-curve is vertical and we are always at full-employment (this is the classical case). This implies that the unemployment rate stays at the natural rate, but output goes up since workers are now more productive.1.→2. Cost of prod.↑== > AS →Ex.S. == > P↓real ms ↑i ↓I↑Y↑Effect: Y↑UR ↓P ↓i↓0 Y o FE Y1FE Y5. "Monetary expansion will not change interest rates in the classical AS-curvemodel." Comment on this statement.An increase in the nominal money supply will shift the AD-curve to the right. There will be excess demand for goods and services, which will force the price level up. In the classical AS-curve model, a new equilibrium will be established at the same level of output but at a higher price level. Real money balances will be reduced to their original level and interest rates will not be affected in the long run (the classical case).6. "Expansionary fiscal policy does not affect the level of real output or real moneybalances in the classical AS-curve case." Comment on this statement.Expansionary fiscal policy will shift the AD-curve to the right, causing excess demand for goods and services at the existing price level. This forces the price level up, reducing real money balances. Interest rates increase, which results in a lower level of investment spending. In the classical case, the AS-curve is vertical, so the level of output will not change. In other words, the increase in the level of prices and interest rates continues until private spending is reduced again to the original full-employment level.7. "In the classical AS-curve case, a reduction in government spending will lowerinterest rates and the real money stock." Comment on this statement.A decrease in government spending will shift the AD-curve to the left, causing excess supply of goods and services at the original price level. As the price level decreases to restore equilibrium, real money balances increase and interest rates fall. This will increase the level of investment spending until a new equilibrium is reached at the original level of output but at lower prices and interest rates. Thus, real money balances will rise, but interest rates fall.8. "In the Keynesian aggregate supply curve model, the Fed, through restrictivemonetary policy, can easily lower inflation without creating unemployment."Comment on this statement.This statement is wrong. In the Keynesian aggregate supply curve model, the AS-curve is horizontal, since prices are assumed to be fixed. Restrictive monetary policy will shift the AD-curve to the left. This will reduce the level of output without any change in the price level. But a lower level of output implies a higher rate of unemployment.9. True or false? Why?"Monetary policy does not affect real output in the Keynesian supply curve model."False. An increase in money supply will shift the AD-curve to the right, leading to a higher level of income. In the Keynesian supply curve model, the price level is fixed, hence real balances will not fall as they would in the classical supply curve model. We will reach a new equilibrium at a higher level of output, at a lower interest rate, but at the same price level. In this case monetary policy is not neutral.10. Explain why there is so much interest in finding ways to shift the AS-curve to the right.Shifting the AS-curve to the right seems to be the only way to offset the effects of an adverse supply shock without negative side effects. An adverse supply shock, such as an increase in oil prices, causes a simultaneous increase in unemployment and inflation, and policy makers have only two options for demand-management policies. Expansionary fiscal or monetary policy will help to achieve full employment faster but will raise the price level, while restrictive fiscal or monetary policy will reduce inflationary pressure but increase unemployment. Therefore, any policy that would shift the short-run AS-curve back to the right seems preferable, since it might bring the economy back to the original equilibrium by simultaneously lowering inflation and unemployment.11. "Restrictive fiscal policy will always lower output, prices, and interest rates."Comment.This statement is true in the intermediate run when the AS-curve is upward sloping. Restrictive fiscal policy will shift the AD-curve to the left. In the Keynesian case, the AS-curve is horizontal and prices remain constant, while both output and interest rates decrease. In the classical case, the AS-curve is vertical and the decrease in the price level will increase real money balances and interest rates. Prices will fall until spending is again consistent with the full-employment level of output. Thus in the long run, prices and interest rates will decline, while output will remain the same. Only in the intermediate run (when the AS-curve is upward sloping due to slowly adjusting wages and prices) will output, prices, and the interest rate all go down.12. "The real impact of demand management policy is largely determined by theflexibility of wages and prices." Comment on this statement.If wages and prices are completely flexible, then the economy will always be at the full-employment level of output, independent of the price level. In other words, we have the classical case of a vertical (long-run) AS-curve. In this case, a shift in the AD-curve will affect only the price level but not the level of output. However, if wages and prices are completely inflexible, then we have the (horizontal) Keynesian aggregate supply curve. In this case, any shift of the AD-curve will have a large effect on the level of output but will not affect the price level. Only in the intermediate run, when we have an upward-sloping AS-curve, will the level of output and the price level both be affected by a shift in the AD-curve. More flexibility in wages and prices implies a steeper the AS-curve. Therefore the effect of a shift in the AD-curve will be smaller on output and larger on the price level.13."An increase in the income tax rate will lower the level of output and increase theprice level." Comment on this statement.Supply siders argue that a decrease in income taxes will shift both the AD-curve and the AS-curve to the right (as shown in Figure 5-10). Conversely, an increase in the income tax rate will shift the AD-curve and the AS-curve to the left. The shift in the AD-curve will be fairly large and, in the medium run, will lead to a significant decrease in output without a (significant) change in the price level. However, in the long run, the AS-curve will also shift to the left, since higher income tax rates provide a disincentive to work. Since the AS-curve will shift only by a fairly small amount, we will see a slightly lower real GDP with a large decrease in the price level.。
13宏观经济学英文版(多恩布什)课后习题答案全解
Chapter 13Solutions to the Problems in the Textbook:Conceptual Problems:1.a. According to the life-cycle theory of consumption, people try to maintain a fairly stable consumption pathover their lifetime. Individuals save during their working years so they can keep up the same consumption stream after they retire. This implies that wealth increases steadily until retirement while consumption remains stable. We should therefore expect the ratio of consumption to accumulated saving (wealth) to decrease over time up to retirement.1.b. After retirement, wealth is used up to finance consumption during the remaining years. Therefore the ratioof consumption to accumulated saving (wealth) increases again after retirement, eventually approaching 1.2.a. Suppose that you and your neighbor both work the same number of years until retirement and you bothhave the same annual income. If your neighbor is in bad health and does not expect to live as long as you do, she will expect to have fewer retirement years in which to use accumulated wealth to finance a steady consumption stream. Your neighbor's goal for retirement saving will not be as high as yours, and compared to you, she will have a higher level of consumption over her working years.Since planned annual consumption (C) is determined by the number of working years (WL), the number of years to live (NL), and income from labor (YL), we get the equation:C = [(WL)/(NL)](YL).WL and YL are the same for you and your neighbor, but NL is smaller for your neighbor. Therefore you will have a lower level of consumption (C).(Note: Students may come up with a variety of different answers. For one, your neighbor, who is in bad health, currently has much larger medical bills than you do. Therefore she may not be able to save as much for retirement, even if she might expect to live as long as you. On the other hand, she may not have large medical bills now, but expects them later, as she gets older. This may induce her to save more now.While such arguments are valid, instructors should point out that the answer should be related to the life-cycle theory.)2.b. If we assume for simplicity that the rate of return on Social Security is the same as the rate of return onprivate saving, then the introduction of a Social Security system based on a trust fund should not have any effect on your level of consumption. Social Security may be considered a form of "forced saving," since you are forced to pay Social Security taxes during your working years and will, in return, receive benefits during your retirement years. However, most likely you would have voluntarily saved as much as the government is now “forcing” you to save with levying a Social Security tax. Therefore your consumption behavior will not change. Still, the levying of a Social Security tax reduces disposable income during your working years, increasing the ratio of consumption to disposable income (the average propensity to consume). If private saving were simply replaced with government saving, national saving would not be affected.In reality, however, the Social Security system is not strictly financed through a trust fund, but largely on a pay-as-you-go basis. The size of the Social Security trust fund was fairly insignificant until the system was amended in 1983. Now the trust fund is increasing and, in effect, contributing to the federal budget surplus. But because of our aging population, predictions are that the Social Security system will experience severe financial difficulties within the next 20-30 years. If the credibility of the system becomes an issue, people may intensify their saving efforts, since they no longer feel they can rely on the1public system to provide for them during retirement. In the past, most of the Social Security taxes were not "saved" but immediately used by the government to finance the benefits of the current retirees. This is why most economists claim that the Social Security system has led to a decrease in the national savings rate and a decrease in the rate of capital accumulation. The magnitude of this decrease, however, has not been clearly established.3.a. If you get a yearly Christmas bonus, you immediately treat it as part of your permanent income and spendit accordingly, that is, ∆C = c(∆Y). In other words, your current consumption will change significantly. 3.b. If you get a Christmas bonus for only this year, you will consider it as transitory income. Since yourpermanent income is hardly affected, you will consume only a small fraction of it and save the rest. In other words, your current consumption will not be significantly affected.4. Gamblers (or thieves) seldom have a very stable income. However, their consumption is determined bytheir permanent income, that is, their expected average lifetime income. Whether they have a large or small income during any given period, their consumption pattern remains relatively stable, since their permanent income is not significantly affected by temporary changes in earnings.5. Both theories, in their own way, try to explain why the short-run mpc is smaller than the long-run mpc.The life-cycle theory attributes the difference to the fact that people prefer a smooth consumption stream over their lifetime. Therefore the average expected lifetime income is the true determinant of current consumption. The permanent income theory suggests that the difference is due to measurement errors.Measured income has two components, that is, permanent and transitory income. But only permanent income is a true determinant of current consumption.6.a. One possible explanation could be that the “baby boomers” were still in their dissaving phase. In otherwords, if households of the baby boom generation still had to buy houses or pay for expenses related to childcare in their late twenties, they may not have been able to save for retirement yet.6.b. If the above explanation is correct, one can expect an increase in saving as these “baby boomers” age,become more financially solvent, and begin to prepare for retirement.7. The ranking from highest to lowest value should be first (a), then (d), and then (b). Clearly, (c) shouldbe lower than (a), but where exactly it ranks after that depends largely on the severeness of the liquidity constraint.8. A series follows a random walk when future changes cannot be predicted from past behavior. In otherwords, it does not have a mean or clear long-run value. Any major change comes about because of random shocks. Hall asserted that changes in current consumption largely come from unanticipated changes in income. According to the life-cycle theory or permanent-income theory, people try to smoothen out their consumption stream in such a way that its expected value is always the same in each period. Therefore, we can express future consumption as the expected value plus some error term, that is, some random value that is unpredictable. This error term is a shock to future income that is spread over the remaining lifetime.Hall supported the permanent-income hypothesis by showing that lagged consumption is the most2significant determinant of future consumption.9. The problem of excess sensitivity means that consumption responds more strongly to predictable changesin current income than the life-cycle theory and permanent-income theories predict. The problem of excess smoothness means that consumption does not respond as strongly to unpredictable changes in current income as these theories predict. However, the existence of these problems does not invalidate the theories.It simply means that the theories can explain consumption behavior only to a certain degree.10. Precautionary (or buffer stock) saving can be explained by uncertainty. It could be uncertainty in regardto one’s life expectancy or one’s time of retirement (af fecting the accumulated saving needed to finance retirement), or uncertainty about future spending needs (which may be caused by a change in family composition or health). Clearly, if we account for such uncertainties, we bring the model much closer to reality. For example, many elderly still continue to save after retirement in anticipation of predicted high medical costs not covered by Medicare.11.a. It is unclear whether an increase in the interest rate leads to an increase or a decrease in saving. On the onehand, as the interest rate increases, the return on saving increases and people may therefore increase their savings effort (due to the substitution effect). On the other hand, a higher return on saving implies that a given future savings goal can now be reached with a smaller savings effort in each year (due to the income effect).11.b. The income effect and the substitution effect generally tend to go in different directions, and the overalloutcome depends on the relative magnitude of these two effects. Until now, empirical evidence has not established a significant sensitivity of saving to changes in the interest rate. This would imply that the income and the substitution effects have about the same magnitude.12.a. According to the Barro-Ricardo hypothesis, it does not matter whether an increase in government spendingis financed by taxation or by issuing debt.12.b. The Barro-Ricardo hypothesis states that people realize that government debt financing by issuing bondssimply postpones taxation. In other words, people know that the government will have to raise taxes in the future to pay back what they have borrowed now. Therefore, expansionary fiscal policy that results in an increase in the budget deficit will no stimulate the economy since it will lead to an increase in saving rather than consumption. People want to be prepared to pay future taxes.12.c. There are two main objections to the Barro-Ricardo hypothesis. One is based on liquidity constraints, thatis, people may want to consume more but may not be able to borrow as much as they like. Therefore, if there is a tax cut, they will consume more, rather than save the tax cut. The other argument is that those people who benefit from a tax cut or an increase in government spending are not the same as those who will have to pay the higher taxes to pay off the debt. This argument assumes that people are not concerned about the welfare of their descendants.Technical Problems:1.a. If income remains constant over time, permanent income equals current income. Your permanent income3this year is YP0 = (1/5)(5*20,000) = 20,000.1.b. Your permanent income next year is YP1 = (1/5)(30,000 + 4*20,000) =1.c. Since C = 0.9YP, your consumption this year is C0 = 0.9*20,000 = 18,000.Your consumption next year is C1 = 0.9*19,000 = 17,100.1.d. In the short run, the mpc = (0.9)(1/5) = 0.18; but in the long run, the mpc = 0.9.1.e. We have already calculated this and next year's permanent income. In each of the coming years you add$30,000 and subtract $20,000, and therefore your permanent income (which is your average over a five year period) will increase by $2,000 each year until it reaches $30,000 after 5 years.YP o = (1/5)(5*20,000) = 20,000YP1 = (1/5)(1*30,000 + 4*20,000) = 22,000YP2 = (1/5)(2*30,000 + 3*20,000) = 24,000YP3 = (1/5)(3*30,000 + 2*20,000) = 26,000YP4 = (1/5)(4*30,000 + 1*20,000) = 28,000YP5 = (1/5)(5*30,000) = 30,000Y30,00028,00026,00024,00022,00020,0000 1 2 3 4 5 time2.a. The person lives for NL = 4 periods and earns a lifetime income ofYL = 30 + 60 + 90 + 0 = 180.Therefore consumption in each period will be C i = (1/4)180 = 45, i = 1, 2, 3, 4.This implies that saving in each period is:S1 = 30 - 45 = - 15; S2 = 60 - 45 = + 15; S3 = 90 - 45 = + 45; S4 = 0 - 45 = - 45.2.b. If liquidity constraints exist and the person cannot borrow in the first period, then she will consume all ofher income, that is, Y1 = C1 = 30.For the remaining three periods the person wants a stable consumption stream. Thus she will consume C(i) = (1/3)(60 + 90 + 0) = 50 in each of the remaining three periods i = 2, 3, 4.42.c. An increase in wealth of only $13 is not enough to offset the difference in consumption patterns betweenperiod 1 and the other periods. Therefore all of the increase in wealth will be consumed in period 1, such that C1 = 43. In the remaining three periods, consumption will be the same as in 2.b.An increase in wealth of $23 will be enough to offset the difference in consumption patterns. Lifetime consumption in each period will now be C i = (1/4)(180 + 23) = 50.75. This means that 20.75 (or almost all of the additional wealth) will be used up in the first period; the remaining 2.25 will be distributed over the next three years.3.a. According to the life-cycle theory and permanent income hypothesis (LC-PIH), the change in consumptionequals the surprise element, that is, ∆C LC-PIH= ε. According to the traditional theory, the change in consumption equals ∆C tr = c(∆YD). Therefore if a fraction λ of the population behaves according to the traditional theory and the other fraction behaves according to LC-PIH, then the total change in consumption is∆C = λ(∆C tr) + (1 - λ)(∆C LC-PIH) = λc(∆YD)+ (1 - λ)cε = (0.7)(0.8)10 + (0.3)ε = 5.6 + (0.3)ε3.b. ∆C = (.3)(.8)10 + (.7)ε = 2.4 + (.7)ε3.c. ∆C = (0)(.8)10 + 1ε = ε4.a. If the real interest rate increases, the opportunity cost of consuming should increase. Therefore, theaverage propensity to save, that is, the fraction of total income that is saved, should increase.4.b. If you only save for retirement and your savings goal is fixed, then you actually will save less. With ahigher interest rate it will take less saving each year to achieve your goal.4.c. The first case (4.a.) describes the substitution effect, whereas the second case (4.b.) describes the incomeeffect. Unless the magnitude of each of these effects is known, we cannot predict the overall effect of this interest rate increase on saving.5. One way to increase saving would be to either privatize or eliminate the Social Security system, so peoplewould have to save for retirement on their own. (Eliminating Social Security is not a very popular measure, but the privatization of Social Security is often discussed.) This would do away with the negative effect on saving that comes from the pay-as-you-go nature of financing Social Security. Another way might be to make it more difficult to borrow. The U.S. tax system encourages people (and firms) to borrow rather than save.5Additional Problems:1. As a share of GDP, how large is consumption compared to the other three main components.Would you expect consumption's share to increase or decrease in a recession?Consumption expenditures are roughly two thirds of total GDP, which is higher than the other three components (investment, government purchases, and net exports) taken together. The ratio of consumption to GDP, however, does not always remain constant. In a recession, for example, when income is below trend, we should expect the consumption-to-GDP ratio to increase, while in a boom, when income is above trend, we should expect the ratio to decrease. The reason is that current consumption is based on permanent rather than current income and when current income is greater than permanent income, the ratio of consumption to income (the apc) goes down. This argument is reinforced by the concept of automatic stability. When GDP falls, personal disposable income falls by less and thus consumption does not fall dramatically.2. True or false? Why?"The marginal propensity to consume out of transitory income is greater than the marginal propensity to consume out of permanent income."False. The permanent-income hypothesis argues that consumption is related to permanent disposable income. Individuals will only revise their consumption behavior significantly if they perceive a change in income as permanent. Very often people are uncertain as to whether a rise in income is permanent or transitory, so they do not significantly revise their consumption patterns immediately. This suggests a lower marginal propensity to consume out of transitory income than out of permanent income.3. Do you think that the marginal propensity to consume out of current income would differ betweentenured professors who have a high degree of job security and professional gamblers who never know when luck will strike?Tenured professors have a high degree of job security and their income does not vary a great deal. They can therefore relatively accurately estimate their permanent income. This means that their current consumption is largely based on current income, implying that their short-run mpc is fairly high. Gamblers, on the other hand, never know what their income in any given year is going to be. Therefore, they base their consumption decisions on their average expected lifetime income (permanent income) rather than on current income. This implies that their short-run mpc is fairly low.4. Is the short-run marginal propensity to save different between farmers and government employees?Why or why not?Government employees generally have very stable incomes and high job security. Therefore they base their consumption decision to a large extent on current income so their short-run mpc is high, while their short-run mps is low. Farmers, on the other hand, have highly variable incomes, depending on weather conditions. Therefore they tend to base their consumption decisions on their permanent income. Their short-run mpc is low, while their short-run mps is high.5. "If most people base their consumption decisions on their current rather than their permanentincome, then the short-run multiplier is greater than the long-run multiplier." Comment on this6statement.If most people follow the traditional theory and base their consumption decisions mostly on current income, then their mpc out of current income is high, making the value of the short-run multiplier high. But if most people follow the permanent-income theory and base their consumption decisions primarily on permanent income, then the short-run mpc is low, making the value of the short-run multiplier low. In either case, as long as some people follow the permanent-income theory, then the short-run multiplier should always be smaller than the long-run multiplier.6. Assume you define your permanent income as the average of this and the past four years’ incomesand you always consume 4/5 of your permanent income. Your earnings record over these years has been: Y t= 40,000, Y t-1 = 38,000, Y t-2 = 34,000, Y t-3 = 32,000, Y t-4 = 31,000.If next year your income increases to Y t+1= 46,000, by how much will your consumption change between year t and year t+1?YP t= (1/5)(40,000 + 38,000 + 34,000 + 32,000 + 31,000) = (1/5)175,000 = 35,000C t= (4/5)YP t = (4/5)35,000 = 28,000YP t+1 = (1/5)(46,000 + 40,000 + 38,000 + 34,000 + 32,000) = (1/5)190,000 = 38,000C t+1 = (4/5)YP t+1 = (4/5)38,000 = 30,400Therefore your consumption will change by C = 2,400.7. Assume a distant aunt gives you several thousand dollars and you use the money to pay back part ofyour student loan. Does your behavior correspond to the prediction of the permanent-income theory?Why or why not?Paying back your debts actually can be seen as an act of "saving." Therefore, since you use some unexpected income to save (rather than consume), your behavior fits the permanent income theory nicely.8. "Early retirement raises aggregate consumption." Comment on this statement.Early retirement reduces lifetime income and increases the length of retirement. The life-cycle model states that individuals consume on the basis of their average lifetime income to maintain a stable consumption path throughout their lives. In an economy with a constant population and no technological progress, aggregate consumption will fall if retirement age drops because people who retire earlier have to accumulate funds for more retirement years over fewer working years. As this can only be accomplished with greater saving, consumption has to be reduced.However, if the population is growing and retirement benefits are financed through taxes levied on workers currently employed, then aggregate consumption may actually rise. In this case, the working population will be paying for the reduction in lifetime earnings experienced by those who have retired early, and there is less need for retirement saving.9. The simple life-cycle hypothesis predicts that people save over their working years but dissave7during their retirement years. Do we actually observe such behavior? If not, can you explain why not?Most elderly actually do not dissave, but they do save less than they did during their working years. One of the reasons that the elderly still save may be the fact that they anticipate large medical bills as they grow older and therefore prefer to keep a certain buffer stock of saving. The elderly may also hope to leave some of their savings as bequests to their children or grandchildren.10. On October 19, 1987, the Dow Jones industrial average dropped about 500 points, or a little morethan 23%. What effect should a decline in stock values of this magnitude have had on aggregate demand according to the life-cycle theory of consumption?According to the life-cycle theory, any change in wealth should affect consumption behavior. The decline in stock values constituted roughly a $500 billion decline in wealth. However, we did not see a huge decrease in consumption in 1987, since the wealth effect tends to be fairly small. In addition, the Fed reacted promptly, announcing that liquidity would be provided if needed.11. Does the random walk model of consumption disprove the permanent income hypothesis? Why orwhy not?Robert Hall tried to disprove the permanent income theory by applying the concept of rational expectations to the theory of consumption. He asserted that consumption patterns may follow a random walk, that is, changes in consumption may come from unanticipated changes in income. However, by concluding that lagged consumption is the most significant determinant of future consumption, Hall actually supported the predictions of the permanent-income hypothesis.12. How is Hall’s random walk model of consumption related to the permanent-income hypothesis andwhat are the implications of these theories for fiscal policy?Hall asserted that changes in current consumption largely come from unanticipated changes in income. Any major change in consumption comes about because of random shocks. According to the permanent-income theory, people try to smoothen out their consumption stream in such a way that its expected value is always the same in each period. Therefore, we can express future consumption as the expected value plus some error term, that is, some random value that is unpredictable. This error term is a shock to future income that is spread over the remaining lifetime. Hall supported the permanent-income hypothesis by showing that lagged consumption is the most significant determinant of future consumption. The implication for fiscal policy is that a temporary tax change will not significantly affect current consumption, unless there are liquidity constraints.13. True or false? Why?"A temporary tax surcharge never has a significant effect on current consumption."False. If individuals know that the tax surcharge is temporary they will not alter their spending patterns as the tax change has little impact on their permanent income. However, when liquidity constraints exist, individuals may be forced to adjust their consumption behavior immediately. If individuals barely earn enough to finance their current consumption, for example, they may be forced to cut their current consumption if a temporary tax surcharge is levied.814. "As a response to a temporary increase in personal and corporate income taxes consumers willreduce their spending and firms will cut production and increase prices. Therefore all we will get is stagflation, that is, an increase in both unemployment and inflation, and tax revenues won't increase." Comment on this statement.The life-cycle/permanent-income theory of consumption predicts that temporary changes in income will not significantly affect the level of consumption. Thus a temporary tax surcharge should not significantly affect aggregate demand. A similar argument can be made about firms, since changes in production are often costly and therefore a temporary surcharge on corporate income taxes should not affect the level of output and prices. The levels of national income and prices should not be affected significantly but we should see a (temporary) increase in tax revenues due to the surcharge. (Note, however, that if consumers and firms face liquidity constraints, they may react to a temporary surcharge in the way described in the statement.)15. "Any tax cut that results in an increase in the budget deficit will fail to stimulate aggregatedemand." Comment on this statement. In your answer explain the effect of such a tax cut on interest rates, money supply, and private domestic saving.The Barro-Ricardo proposition states that a tax cut that results in a budget deficit increase leads to higher saving. Since people will anticipate a future tax increase to finance the higher deficit, permanent income will not be affected. Thus consumption will not be affected; instead people will save the tax cut. Since this is purely a fiscal policy measure, money supply is not affected. The increase in the budget deficit will lead to higher interest rates due to the increased demand for credit. (Note that evidence from the 1980s does not support this hypothesis. The Reagan tax cuts in 1981 resulted in a large increase in the budget deficit but there was no subsequent increase in saving.)916. Assume the government announces plans for fiscal expansion that are likely to result inincreased government borrowing. What effect should this have on aggregate consumption, money supply, the income velocity of money, the trade deficit, and savings?The Barro-Ricardo proposition states that if fiscal expansion results in a budget deficit, the public will anticipate a future tax increase to finance the deficit. They believe that their permanent income will not be affected and choose to save rather than consume more. Therefore, we should expect an increase in private saving but no significant change in consumption. Thus there is no significant change in national income and, since this is solely a fiscal policy, money supply is also not affected. Therefore there is no change in the income velocity. The trade deficit may also not be significantly affected, since domestic saving supports the budget deficit. However, evidence from the 1980s does not lend support for this hypothesis. Saving did not increase after the Reagan tax cuts that resulted in a huge increase in the budget deficit. Instead, we saw an increase in consumption and the trade deficit, since higher interest rates caused an inflow of funds, leading to an appreciation of the U.S. dollar. The income velocity also increased, due to the increase in economic activity.10。
Chapter_02National Income Accounting(宏观经济学,多恩布什,第十版)
From GDP to National Income
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Use the terms output and income interchangeably in macroeconomics, but are they really equivalent?
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There are a few crucial distinctions between them:
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Chapter 2
National Income Accounting
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Ex. Social security, unemployment benefits Transfer payments are NOT included in GDP since not a part of current production Government expenditure = transfers + purchases
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Some Identities: A Simple Economy
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Assume national income equals GDP, and thus use terms income and output interchangeably (convenience) Begin with a simple economy: closed economy with no public sector output expressed as Y C I (4) Only two things can do with income: consume and save national income expressed as Y C S (5), where S is private savings I Y C S (6) Combine (4) and (5): C
多恩布什宏观经济学第十版课后习题复习资料08
•CHAPTER 8Solutions to the Problems in the Textbook:Conceptual Problems:1. The first question you should ask yourself as a policy maker is whether a disturbance is transitory orpersistent. You should then ask yourself how long it would take to put a suggested policy measure into effect and how long it will take for the policy to have the desired effect on the economy. In addition, you need to know how reliable the estimates of your advisors are about the effects of the policy. If a disturbance is small and probably transitory, you may be best advised to do nothing, because any measure you take is likely to have its effect after the economy has recovered. Therefore your action might only further aggravate the problem.2.a. The inside lag is the time it takes after an economic disturbance has occurred to recognize andimplement a policy action that will address the disturbance.2.b. The inside lag is divided into three parts. First, there is the recognition lag, that is, the time it takes forpolicy makers to realize that a disturbance has occurred and that a policy response is warranted.Second, there is the decision lag, that is, the time it takes to decide on the most desirable policy response after a disturbance is recognized. Finally, there is the action lag, that is, the time it takes to actually implement the policy measure.2.c. Inside lags are shorter for monetary policy than for fiscal policy since the FOMC meets on a regularbasis to discuss and implement monetary policy. Fiscal policy, on the other hand, has to be initiated and passed by both houses of the U.S. Congress and this can be a lengthy process. The exceptions are the so-called automatic stabilizers; however, they only work well for small and transitory disturbances2.d Automatic stabilizers have no inside lag; they are endogenous and function without specificgovernment intervention. Examples are the income tax system, the welfare system, unemployment insurance, and the Social Security system. They all reduce the amount by which output changes in response to an economic disturbance.3.a. The outside lag is the time it takes for a policy action, once implemented, to have its full effect on theeconomy.3.b. Generally, the outside lag is a distributed lag with a small immediate effect and a larger overall effectover a longer time period. The effect is spread over time, since aggregate demand responds to any1 / 1policy change only slowly and with a lag.3.c. Outside lags are longer for monetary policy since monetary policy actions affect short-term interestrates most directly, while aggregate demand depends heavily on lagged values of income, interest rates, and other economic variables. A change in government spending, however, immediately affects aggregate demand.4. Fiscal policy has smaller outside lags, but significant inside lags. Monetary policy, on the other handhas smaller inside lags and longer outside lags. Therefore large open market operations should be undertaken to get an immediate effect, but they should be partially reversed over time to avoid a large long-run effect. If the shock is sufficiently transitory and small, policy makers may be best advised not to undertake any policy change at all.5.a. An econometric model is a statistical description of all or part of the economy. It consists of a set ofequations that are based on past economic behavior.5.b. Econometric models are generally used to forecast the behavior of the economy and the effects ofalternative policy measures.5.c. There is considerable uncertainty about how well econometric models actually represent the workingsof the economy. There is also great uncertainty about the expectations of firms and consumers and their reactions to policy changes. Any policy is bound to fail if the information on which it was based is poor.6.The answer to this question is student specific. The main difficulties of stabilization policy arise fromthree sources. First, policy always works with lags. Second, the outcome of any policy depends on the way the private sector forms expectations and how those expectations affect the public's behavior.Third, there is considerable uncertainty about the structure of the economy and the shocks that hit it.It can be argued that a monetary policy rule would greatly reduce uncertainty about the Fed's policy responses. If the government behaved in a consistent way, then the private sector would also behave more consistently and economic fluctuations could be greatly reduced. A monetary growth rule would also reduce any political pressure the administration might exert on the Fed. It is often initially unclear whether a disturbance is temporary or persistent and a monetary policy rule would prevent policy mistakes in cases where the disturbance is, in fact, temporary. If active monetary policy is applied to a temporary disturbance, then the lags involved will guarantee that the economy will1 / 1actually be destabilized.On the other hand, the workings of the economy are not completely understood and events cannot always be predicted. Thus it is difficult to argue for a fixed policy rule. Unanticipated large disturbances warrant an activist policy, especially if they appear to be persistent. It is also possible to construct a more activist monetary growth rule. For example, Equation (8) suggests that the annual monetary growth rate should be increased by two percent for every one percent that unemployment increases above its natural rate. Such a rule is based on the quantity theory of money equation (which relates money supply growth to the growth of nominal GDP) and on Okun's law (which relates the unemployment rate to economic growth). Obviously, because of the long lags for monetary policy, any monetary growth rule will work much better in the long run than in the short run.Fiscal policy rules may make more sense than monetary policy rules, since fiscal policy has long inside lags but shorter outside lags. In a way, built-in stabilizers, although generally not considered "rules", already provide some stability without any inside lag. Many of the arguments against monetary policy rules are also valid for fiscal policy rules and many economists oppose them. The frequently proposed constitutional amendment requiring an annually balanced budget is an example of a fiscal policy rule. There are significant problems associated with such an amendment, since it would greatly limit the government's ability to undertake active fiscal stabilization policy.7. The arguments for a constant growth rate rule for money are based on the quantity theory of moneyequation, that is,MV = PY.From this equation we can derive%∆P = %∆M - %∆Y + %∆V.If the long-run trend rate of real output (Y) and the long-run trend of velocity (V) are assumed to be fairly stable, and if wages and prices are sufficiently flexible, then a constant monetary growth rate (M) would insure a constant rate of inflation, that is, a constant rate of change in the price level (P).Also, since monetary policy has long outside lags, active monetary policy can actually be more destabilizing than stabilizing. In addition, since we do not know exactly how the economy works or may react to specific policies, it is best to follow a rule rather than undertake actions that have uncertain outcomes. However, rules are not without problems, as they would not allow flexibility in responding to major disturbances.1 / 18. Dynamic inconsistency occurs if, after having committed themselves to a specific policy actiondesigned to achieve a long-run objective, policy makers find themselves in a situation where it seems advantageous to abandon their original policy, in order to achieve a short-run goal. Such action will impede the long-run objective.9. Real GDP targeting is the best option if the primary policy goal of monetary policy is to achieve fullemployment. If policy makers forecast potential GDP correctly, then full employment combined with low inflation can be achieved. However, real GDP targeting bears the greater risk that the secondary goal of achieving a low inflation rate will be missed. If the rate at which potential GDP grows is overestimated, then policy makers may stimulate the economy too much. In this case, they will not be successful in achieving price stability. By targeting nominal GDP, the central bank creates a policy tradeoff between inflation and unemployment. If the rate at which potential GDP grows is overestimated and policy makers stimulate the economy too much, we will get less growth but also less inflation than under real GDP targeting. Which targeting approach should be chosen depends greatly on how steep or flat the Phillips curve is perceived to be.Technical Problems:1. If actual GDP is expected to be $40 billion below the full-employment level and the size of thegovernment spending multiplier is 2, then government spending should be increased by $20 billion over its current level. For the next period, when actual GDP is expected to be $20 billion below potential, government spending should be cut by $10 billion from its new level, that is, to $10 billion over its original level. In period three, when actual GDP is expected to be at its full-employment level, the level of government spending should again be cut by $10 billion from the last period's level to bring it back to the original level of Period 0.2.a. If there is a one-period outside lag for government spending, then nothing can be done to close thecurrent GDP-gap. The government should decide to spend $10 billion more for the next period and reduce spending again to its original level after that.2.b. Graph I below shows the path of GDP for Problem 1 with no outside lag and Graph II shows the pathof GDP for problem 2.a. with a one-period outside lag. In each of the graphs the path of actual GDP is shown, first assuming that no policy action takes place and then assuming that the policies proposed in Problems 1 and 2.a. are undertaken.1 / 1Graph IGDP GDPpotential GDP potential GDP0 time 0 timeGDP with fiscal policy GDP without fiscal policyGraph IIGDP GDPpotential GDP potential GDP0 time 0 timeGDP with fiscal policy GDP without fiscal policy3.a. Since the government multiplier for the first period is 1, the level of government spending must beincreased by G = $40 billion to close the GDP-gap of $40 billion. But since the government multiplier in the next period for the amount spent in this period is 1.5, the effect of an increase in government spending in the first period by $40 billion would be an increase in GDP by $60 billion in the second period.3.b. For the second period a GDP-gap of $20 billion is expected. However, as we saw in 3.a., GDP willincrease by $60 billion in the second period if the government increases spending by $40 billion in the first period. Therefore, the government has to reduce spending in the second period by $40 billion from its new level (back to its original level), since the multiplier for a spending change in the same period is 1.3.c. In this problem, fiscal policy has an outside lag. This means that the effect of an increase ingovernment spending is felt both in the period in which the spending increase takes place and (to an even larger degree) in the following period. The increase in government spending needed to close the1 / 1GDP-gap in the first period is guaranteed to overshoot the desired goal in the next period. Thus the government will be forced to reverse its increase in spending to the original level in the second period to offset the destabilizing effect. In a case like this, the government has to be much more active in its fiscal policy than in a situation where no distributed lag exists.4. If there is uncertainty about the size of the multiplier, then fiscal policy becomes much morecomplicated. If the multiplier is 1, then an increase in government spending by $40 billion will close the GDP-gap in the first period. If the multiplier is 2.5, we will overshoot potential GDP by $60 billion. An increase in spending by 40/2.5 = $16 billion is optimal if the multiplier is 2.5. Thus a cautious government will probably increase spending by no more than $16 billion in the first period, and then reduce the level of spending by $8 billion in the next period ($8 billion above the original level). Such a policy action is designed to close the GDP-gap to some degree over the first two periods while never overshooting potential GDP. In Period 3 we will again be back at the full-employment level. The extent to which a less cautious government might exceed these suggested spending increases depends largely on that government's level of concern about unemployment versus inflation.5. To follow an established rule for its policy, the Fed needs to know the source of each disturbance. If adisturbance comes from the goods sector, it is better to have a monetary growth target; if the disturbance comes from the money sector, it is better to have an interest rate target.a. Assume a disturbance comes from the money sector. If an increase in money demand increases theinterest rate, the Fed should try to maintain a constant interest rate by increasing the supply of money.This will re-establish the old equilibrium values of the interest rate and output and effectively offset the disturbance.b. Assume a disturbance comes from the goods sector. If an increase in autonomous investmentincreases the interest rate, then it is not advisable to maintain a constant interest rate. Trying to lower the interest rate again by increasing the money supply would aggravate the disturbance. On the other hand, maintaining a constant money supply, while not offsetting the disturbance, will at least not make things worse.6.a. Students will have to check the Federal Reserve Bulletin in early 2000 and compare the forecasts ofthe Federal Reserve Board with the actual performance of the economy in 1999.6.b. Regardless of how detailed it is, no econometric model can accurately represent the economy, sincewe do not completely understand the way the economy works. Therefore, we can never expect perfect1 / 1forecasts. It is impossible to incorporate all the relevant information on which individuals and firms base their expectations about the future and to determine how these expectations affect actions in any given situation. Forecasts are generally based on the information available at the time, which may be flawed or outdated. In addition, any unexpected change, such as a supply shock, an unanticipated international change, or an unanticipated domestic policy change, can render the initial predictions wrong.1 / 1。
多恩布什<宏观经济学>第八版第三章英文答案
Solutions to the Problems in the TextbookConceptual Problems:1. The production function provides a quantitative link between inputs and output. For example, theCobb-Douglas production function mentioned in the text is of the form:Y = F(N,K) = AN1-θKθ,where Y represents the level of output. (1 - θ) and θ are weights equal to the shares of labor (N) and capital (K) in production, while A is often used as a measure for the level of technology. It can be easily shown that labor and capital each contribute to economic growth by an amount that is equal to their individual growth rates multiplied by their respective share in income.2. The Solow model predicts convergence, that is, countries with the same production function, savingsrate, and population growth will eventually reach the same level of income per capita. In other words,a poor country may eventually catch up to a richer one by saving at the same rate and makingtechnological innovations. However, if these countries have different savings rates, they will reach different levels of income per capita, even though their long-term growth rates will be the same.3. A production function that omits the stock of natural resources cannot adequately predict the impactof a significant change in the existing stock of natural resources on the economic performance of a country. For example, the discovery of new oil reserves or an entirely new resource would have a significant effect on the level of output that could not be predicted by such a production function.4. Interpreting the Solow residual purely as technological progress would ignore, for example, theimpact that human capital has on the level of output. In other words, this residual not only captures the effect of technological progress but also the effect of changes in human capital (H) on the growth rate of output. To eliminate this problem we can explicitly include human capital in the production function, such thatY = F(K,N,H) = AN a K b H c with a + b + c = 1.Then the growth rate of output can be calculated as∆Y/Y = ∆A/A + a(∆N/N) + b(∆K/K) + c(∆H/H).5. The savings function sy = sf(k) assumes that a constant fraction of output is saved. The investmentrequirement, that is, the (n + d)k-line, represents the amount of investment needed to maintain a constant capital-labor ratio (k). A steady-state equilibrium is reached when saving is equal to the investment requirement, that is, when sy = (n + d)k. At this point the capital-labor ratio k = K/N is not changing, so capital (K), labor (N), and output (Y) all must be growing at the same rate, that is, the rate of population growth n = (∆N/N).266. In the long run, the rate of population growth n = (∆N/N) determines the growth rate of the steady-state output per capita. In the short run, however, the savings rate, technological progress, and the rate of depreciation can all affect the growth rate.7. Labor productivity is defined as Y/N, that is, the ratio of output (Y) to labor input (N). A surge inlabor productivity therefore occurs if output grows at a faster rate than labor input. In the U.S. we have experienced such a surge in labor productivity since the mid-1990s due to the enormous growth in GDP. This surge can be explained from the introduction of new technologies and more efficient use of existing technologies. Many claim that the increased investment in and use of computer technology has stimulated economic growth. Furthermore, increased global competition has forced many firms to cut costs by reorganizing production and eliminating some jobs. Thus, with large increases in output and a slower rate of job creation we should expect labor productivity to increase.(One should also note that a higher-skilled labor force also can contribute to an increase in labor productivity, since the same number of workers can produce more output if workers are more highly skilled.)Technical Problems:1.a. According to Equation (2), the growth of output is equal to the growth in labor times the labor shareplus the growth of capital times the capital share plus the rate of technical progress, that is, ∆Y/Y = (1 - θ)(∆N/N) + θ(∆K/K) + ∆A/A, where1 - θ is the share of labor (N) and θ is the share of capital (K). Thus if we assume that the rate oftechnological progress (∆A/A) is zero, then output grows at an annual rate of 3.6 percent, since ∆Y/Y = (0.6)(2%) + (0.4)(6%) + 0% = 1.2% + 2.4% = + 3.6%,1.b. The so-called "Rule of 70" suggests that the length of time it takes for output to double can becalculated by dividing 70 by the growth rate of output. Since 70/3.6 = 19.44, it will take just under 20 years for output to double at an annual growth rate of 3.6%,1.c. Now that ∆A/A = 2%, we can calculate economic growth as∆Y/Y = (0.6)(2%) + (0.4)(6%) + 2% = 1.2% + 2.4% + 2% = + 5.6%.Thus it will take 70/5.6 = 12.5 years for output to double at this new growth rate of 5.6%.2.a. According to Equation (2), the growth of output is equal to the growth in labor times the labor shareplus the growth of capital times the capital share plus the growth rate of total factor productivity (TFP), that is,∆Y/Y = (1 - θ)(∆N/N) + θ(∆K/K) + ∆A/A, where271 - θ is the share of labor (N) and θ is the share of capital (K). In this example θ = 0.3; therefore, ifoutput grows at 3% and labor and capital grow at 1% each, then we can calculate the change in TFP in the following way3% = (0.3)(1%) + (0.7)(1%) + ∆A/A ==> ∆A/A = 3% - 1% = 2%,that is, the growth rate of total factor productivity is 2%.2.b. If both labor and the capital stock are fixed and output grows at 3%, then all this growth has to becontributed to the growth in factor productivity, that is, ∆A/A = 3%.3.a. If the capital stock grows by ∆K/K = 10%, the effect on output would be an additional growth rate of∆Y/Y = (.3)(10%) = 3%.3.b. If labor grows by ∆N/N = 10%, the effect on output would be an additional growth rate of∆Y/Y = (.7)(10%) = 7%.3.c. If output grows at ∆Y/Y = 7% due to an increase in labor by ∆N/N = 10%, and this increase in laboris entirely due to population growth, then per capita income would decrease and people’s welfare would decrease, since∆y/y = ∆Y/Y - ∆N/N = 7% - 10% = - 3%.3.d. If this increase in labor is due to an influx of women into the labor force, the overall population doesnot increase and income per capita would increase by ∆y/y = 7%. Therefore people's welfare would increase.4. Figure 3-4 shows output per head as a function of the capital-labor ratio, that is, y = f(k). The savingsfunction is sy = sf(k), and it intersects the straight (n + d)k-line, representing the investment requirement. At this intersection, the economy is in a steady-state equilibrium. Now let us assume that the economy is in a steady-state equilibrium before the earthquake hits, that is, the steady-state capital-labor ratio is currently k*. Assume further, for simplicity, that the earthquake does not affect people's savings behavior.If the earthquake destroys one quarter of the capital stock but less than one quarter of the labor force, then the capital-labor ratio falls from k*to k1 and per-capita output falls from y* to y1. Now saving is greater than the investment requirement, that is, sy1 > (d + n)k1, and the capital stock and the level of output per capita will grow until the steady state at k* is reached again.However, if the earthquake destroys one quarter of the capital stock but more than one quarter of the labor force, then the capital-labor ratio increases from k*to k2. Saving now will be less than the investment requirement and thus the capital-labor ratio and the level of output per capita will fall until the steady state at k* is reached again.If exactly one quarter of both the capital stock and the labor stock are destroyed, then the steady state is maintained, that is, the capital-labor ratio and the output per capita do not change.2829If the severity of the earthquake has an effect on peoples’ savings behavior, then the savings function sy = sf(k) will move either up or down, depending on whether the savings rate (s) increases (if people save more, so more can be invested in an effort to rebuild) or decreases (if people save less, since they decide that life is too short not to live it up).yy 2 y * y 10 k 1 k k 2 k5.a. An increase in the population growth rate (n) affects the investment requirement, and the (n + d)k-line gets steeper. As the population grows, more saving must be used to equip new workers with the same amount of capital that the existing workers already have. Therefore output per capita (y) will decrease as will the new optimal capital-labor ratio, which is determined by the intersection of the sy-curve and the (n 1 + d)k-line. Since per-capita output will fall, we will have a negative growth rate in the short run. However, the steady-state growth rate of output will increase in the long run, since it will be determined by the new and higher rate of population growth.y y o y 1k1 k o k5.b. Starting from an initial steady-state equilibrium at a level of per-capita output y*, the increase in thepopulation growth rate (n) will cause the capital-labor ratio to decline from k* to k1. Output per capita will also decline, a process that will continue at a diminishing rate until a new steady-state level is reached at y1. The growth rate of output will gradually adjust to the new and higher level n1.yy*y1t o t1 tkk*k1t o t1 t6.a. Assume the production function is of the formY = F(K, N, Z) = AK a N b Z c ==>∆Y/Y = ∆A/A + a(∆K/K) + b(∆N/N) + c(∆Z/Z), with a + b + c = 1.Now assume that there is no technological progress, that is, ∆A/A = 0, and that capital and labor grow at the same rate, that is, ∆K/K = ∆N/N = n. If we also assume that all natural resources available are fixed, such that ∆Z/Z = 0, then the rate of output growth will be∆Y/Y = an + bn = (a + b)n.In other words, output will grow at a rate less than n since a + b < 1. Therefore output per worker will fall.6.b. If there is technological progress, that is, ∆A/A > 0, then output will grow faster than before, namely30∆Y/Y = ∆A/A + (a + b)n.If ∆A/A > c, then output will grow at a rate larger than n, in which case output per worker will increase.6.c. If the supply of natural resources is fixed, then output can only grow at a rate that is smaller than therate of population growth and we should expect limits to growth as we run out of natural resources.However, if the rate of technological progress is sufficiently large, then output can grow at a rate faster than population, even if we have a fixed supply of natural resources.7.a. If the production function is of the formY = K1/2(AN)1/2,and A is normalized to 1, then we haveY = K1/2N1/2.In this case capital's and labor's shares of income are both 50%.7.b. This is a Cobb-Douglas production function.7.c. A steady-state equilibrium is reached when sy = (n + d)k.From Y = K1/2N1/2 ==> Y/N = K1/2N-1/2 ==> y = k1/2==>sk1/2= (n + d)k ==> k-1/2 = (n + d)/s = (0.07 + 0.03)/(.2) = 1/2 ==> k1/2= 2 = y ==> k = 4 .8.a. If technological progress occurs, then the level of output per capita for any given capital-labor ratioincreases. The function y = f(k) increases to y = g(k), and thus the savings function increases from sf(k) to sg(k).yy1k1 k2k8.b. Since g(k) > f(k), it follows that sg(k) > sf(k) for each level of k. Therefore the intersection of thesg(k)-curve with the (n + d)k-line is at a higher level of k. The new steady-state equilibrium will now be at a higher level of saving and output per capita, and at a higher capital-labor ratio.8.c. After the technological progress occurs, the level of saving and investment will increase until a newand higher optimal capital-labor ratio is reached. The ratio of investment to capital will also increase in the transition period, since more has to be invested to reach the higher optimal capital-labor ratio.kk2k1t1 t2t9. The Cobb-Douglas production function is defined asY = F(N,K) = AN1-θKθ.The marginal product of labor can then be derived asMPN = (∆Y)/(∆N) = (1 - θ)AN-θKθ = (1 - θ)AN1-θKθ/N = = (1 - θ)(Y/N)==> labor's share of income = [MPN*(N)]/Y = (1 - θ)(Y/N)*[(N)/(Y)] = (1 - θ)32。
多恩布什宏观经济学第十版课后习题答案09
多恩布什宏观经济学第十版课后习题答案09CHAPTER 9INCOME AND SPENDINGSolutions to the Problems in the Textbook:Conceptual Problems:1. In the Keynesian model, the price level is assumed to be fixed, that is, the AS-curve is horizontal andthe level of output is determined solely by aggregate demand. The classical model, on the other hand, assumes that prices always fully adjust to maintain a full-employment level of output, that is, the AS-curve is vertical. Since the model of income determination in this chapter assumes that the price level is fixed, it is a Keynesian model.2. An autonomous variable’s value is determined outside ofa given model. In this chapter the followingcomponents of aggregate demand have been specified as being autonomous: autonomous consumption (C*) autonomous investment (I o), government purchases (G o), lump sum taxes (TA o), transfer payments (TR o), and net exports (NX o).3.Since it often takes a long time for policy makers to agree on a specific fiscal policy measure, it isquite possible that economic conditions may drastically change before a fiscal policy measure is implemented. In these circumstances a policy measure can actually be destabilizing. Maybe the economy has already begun to move out of a recession before policy makers have agreed to implement a tax cut. If the tax cut is enacted at a time when the economy is already beginning to experience strong growth, inflationary pressure can be created.While such internal lags are absent with automatic stabilizers (income taxes, unemployment benefits, welfare), these automatic stabilizers are not sufficient to replace active fiscal policy when the economy enters a deep recession.4. Income taxes, unemployment benefits, and the welfare system are often called automatic stabilizerssince they automatically reduce the amount by which output changes as a result of a change in aggregate demand. These stabilizers are a part of the economic mechanism and therefore work without any case-by-case government intervention. For example, when output declines and unemployment increases, there may be an increase in the number of people who fall below the poverty line. If we had no welfare system or unemployment benefits, then consumption would drop significantly. But since unemployed workers get unemployment compensation and people living in poverty are eligible for welfare payments, consumption will not decrease as much. Therefore, aggregate demand may not be reduced by as much as it would have without these automatic stabilizers.5. The full-employment budget surplus is the budget surplus that would exist if the economy were at thefull-employment level of output, given the current spending or tax structure. Since the size of the full-employment budget surplus does not depend on the position in the business cycle and only changes when the government implements a fiscal policy change, the full-employment budget surplus can be used as a measure of fiscal policy. Other names for the full-employment budget surplus are the structural budget surplus, the cyclically adjusted surplus, the high-employment surplus, and the standardized employment surplus. These names may bepreferable, since they do not suggest that there is a specific full-employment level of output that we were unable to maintain.Technical Problems:1.a. AD = C + I = 100 + (0.8)Y + 50 = 150 + (0.8)YThe equilibrium condition is Y = AD ==>12 Y = 150 + (0.8)Y ==> (0.2)Y = 150 ==> Y = 5*150 = 750.1.b. Since TA = TR = 0, it follows that S = YD - C = Y - C. ThereforeS = Y - [100 + (0.8)Y] = - 100 + (0.2)Y ==> S = - 100 +(0.2)750 = - 100 + 150 = 50.1.c. If the level of output is Y = 800, then AD = 150 + (0.8)800 = 150 + 640 = 790.Therefore the amount of involuntary inventory accumulation is UI = Y - AD = 800 - 790 = 10.1.d. AD' = C + I' = 100 + (0.8)Y + 100 = 200 + (0.8)YFrom Y = AD' ==> Y = 200 + (0.8)Y ==> (0.2)Y = 200 ==> Y = 5*200 = 1,000Note: This result can also be achieved by using the multiplier formula:Y = (multiplier)(?Sp) = (multiplier)(?I) ==> ?Y = 5*50 = 250, that is, output increases from Y o = 750 to Y 1 = 1,000.1.e. From 1.a. and 1.d. we can see that the multiplier is 5.1.f. Sp2001500 750 1,000 Y2.a. Since the mpc has increased from 0.8 to 0.9, the size of the multiplier is now larger and we shouldtherefore expect a higher equilibrium income level than in 1.a.AD = C + I = 100 + (0.9)Y + 50 = 150 + (0.9)Y ==>Y = AD ==> Y = 150 + (0.9)Y ==> (0.1)Y = 150 ==> Y = 10*150 = 1,500.2.b. From ?Y = (multiplier)(?I) = 10*50 = 500 ==> Y 1 = Y o + ?Y = 1,500 + 500 = 2,000.2.c. Since the size of the multiplier has doubled from 5 to 10, the change in output (Y) that results from achange in investment (I) now has also doubled from 250 to 500.2001503.a. AD = C + I + G + NX = 50 + (0.8)YD + 70 + 200 = 320 + (0.8)[Y - (0.2)Y + 100]= 400 + (0.8)(0.8)Y = 400 + (0.64)YFrom Y = AD ==> Y = 400 + (0.64)Y ==> (0.36)Y = 400==> Y = (1/0.36)400 = (2.78)400 = 1,111.11The size of the multiplier is (1/0.36) = 2.78.3.b. BS = tY - TR - G = (0.2)(1,111.11) - 100 - 200 = 222.22 - 300 = - 77.783.c. AD' = 320 + (0.8)[Y - (0.25)Y + 100] = 400 + (0.8)(0.75)Y = 400 + (0.6)YFrom Y = AD' ==> Y = 400 + (0.6)Y ==> (0.4)Y = 400 ==> Y = (2.5)400 = 1,000The size of the multiplier is now reduced to 2.5.3.d. BS' = (0.25)(1,000) - 100 - 200 = - 50BS' - BS = - 50 - (-77.78) = + 27.78The size of the multiplier and equilibrium output will both increase with an increase in the marginal propensity to consume.Therefore income tax revenue will also go up and the budget surplus should increase.3.e. If the income tax rate is t = 1, then all income is taxed. There is no induced spending and equilibriumincome only increases by the change in autonomous spending, that is, the size of the multiplier is 1.From Y = C + I + G ==> Y = C o + c(Y - 1Y + TR o) + I o + G o==> Y = C o + cTR o + I o + G o = A o4. In Problem 3.d. we had a situation where the following was given:Y = 1,000, t = 0.25, G = 200 and BS = - 50.Assume now that t = 0.3 and G = 250 ==>AD' = 50 + (0.8)[Y - (0.3)Y + 100] + 70 + 250 = 370 + (0.8)(0.7)Y + 80 = 450 + (0.56)Y.From Y = AD' ==> Y = 450 + (0.56)Y ==> (0.44)Y = 450==> Y = (1/0.44)450 = 1,022.73BS' = (0.3)(1,022.73) - 100 - 250 = 306.82 - 350 = - 43.18BS' - BS = -43.18 - (-50) = + 6.82The budget surplus has increased, since the increase in tax revenue is larger than the increase in government purchases.5.a. While an increase in government purchases by ?G = 10 will change intended spending by ?Sp = 10,a decrease in government transfers by ?TR = -10 will change intended spending by a smaller amount,that is, by only ?Sp = c(?TR) = c(-10). The change in intended spending equals ?Sp = (1 - c)(10) and equilibrium income should therefore increase byY = (multiplier)(1 - c)10.5.b. If c = 0.8 and t = 0.25, then the size of the multiplier isα = 1/[1 - c(1 - t)] = 1/[1 - (0.8)(1 - 0.25)] = 1/[1 - (0.6)] = 1/(0.4) = 2.5.The change in equilibrium income isY = α(?A o) = α[?G + c(?TR)] = (2.5)[10 + (0.8)(-10)] = (2.5)2 = 55.c. ?BS = t(?Y) - ?TR - ?G = (0.25)(5) - (-10) - 10 = 1.25Additional Problems:1. "An increase in the marginal propensity to save increases the impact of one additional dollar inincome on consumption." Comment on this statement. In your answer discuss the effect of sucha change in the mps on the size of the expenditure multiplier.The fact that the marginal propensity to save (1 - c) has risen implies that the marginal propensity to consume (c) has fallen. This means that now one extra dollar in income earned will affect consumption by3less than before the reduction in the mpc. When the mpc is high, one extra dollar in income raises consumption by more than when the mpc is low. If the mps is larger, then the expenditure multiplier will be larger, since the expenditure multiplier is defined as 1/(1-c).2. Using a simple model of the expenditure sector without any government involvement, explainthe paradox of thrift that asserts that a desire to save may not lead to an increase in actual saving.The paradox of thrift occurs because the desire to increase saving leads to a lower consumption level. But a lower level of spending sends the economy into a recession and we get a new equilibrium at a lower level of output. In the end, the increase inautonomous saving is exactly offset by the decrease in induced saving due to the lower income level. In other words, the economy is in equilibrium when S = I o. Since the level of autonomous investment (I o) has not changed, the level of saving at the new equilibrium income level must also equal I o.This can also be derived mathematically. Since an increase in desired saving is equivalent to a decrease in desired consumption, that is, ?C o = -?S o, the effect on equilibrium income is ?Y = [1/(1 - c)](?C o) = [1/(1 - c)](-?S o).Therefore the overall effect on total saving isS = s(?Y) + ?S o = [s/(1 - c)](-?S o) + ?S o = 0, since s = 1 - c.3. "When aggregate demand falls below the current output level, an unintended inventoryaccumulation occurs and the economy is no longer in an equilibrium." Comment on this statement.If aggregate demand falls below the equilibrium output level, production exceeds desired spending. When firms see an unwanted accumulation in their inventories, they respond by reducing production. The level of output falls and eventually reaches a level at which total output equals desired spending. In other words, the economy eventually reaches a new equilibrium at a lower value of output.4. For a simple model of the expenditure sector without any government involvement, derive themultiplier in terms of the marginal propensity to save (s) rather than the marginal propensity to consume (c). Does this formula still hold when the government enters the picture and levies an income tax?In the text, the expenditure multiplier for a model without any government involvement was derived as α = 1/(1 - c).But since the marginal propensity to save is s = 1 - c, the multiplier now becomes α = 1/s = 1/(1-c).In the text, we have also seen that if the government enters the picture and levies an income tax, then the simple expenditure multiplier changes toα = 1/[1 - c(1 - t)] = 1/(1 - c').By substituting s = 1 - c, this equation can be easily manipulated, to getα’ = 1/[1 - c + ct] = 1/[s + (1 - s)t] = 1/s'.Just as s = 1 – c, we can say that s' = 1 - c', sinces' = 1 - c' = 1 - c(1 - t) = 1 - c + ct = s + (1 - s)t.This can also be derived in another way:S = YD - C = YD - (C* + cYD) = - C* + (1 - c)YD = - C* + sYD If we assume for simplicity that TR = 0 and NX = 0, thenS + TA = I + G ==> - C* + sYD + TA = I* + G* ==>s(Y - tY - TA*) + tY + TA* = C* + I* + G* ==>4[s + (1 - s)t]Y = C* + I* + G* - (1 - s)TA* = A* ==>Y = (1/[s + (1 - s)t])A* = (1/s')A*.5. The balanced budget theorem states that the government can stimulate the economy withoutincreasing the budget deficit if an increase in government purchases (G) is financed by an equivalent increase in taxes (TA). Show that this is true for a simple model of the expenditure sector without any income taxes.If taxes and government purchases are increased by the same amount, then the change in the budget surplus can be calculated asBS = ?TA o - ?G = 0, since ?TA o = ?G.The resulting change in national income isY = ?C + ?G = c(?YD) + ?G = c(?Y - ?TA o) + ?G= c(?Y) - c(?TA o) + ?G = c(?Y) + (1 - c)(?G) since ?TA o = ?G.==> (1 - c)(?Y) = (1 - c)(?G) ==> ?Y = ?GIn this case, the increase in output (Y) is exactly of the same magnitude as the increase in government purchases (G). This occurs since the decrease in the level of consumption due to the higher lump sum tax has exactly been offset by the increase in the level of consumption caused by the increase in income.6. Assume a model without income taxes and in which the only two components of aggregatedemand are consumption and investment. Show that, in this case, the two equilibrium conditions Y = C + I and S = I are equivalent.We can derive the equilibrium value of output by setting actual income equal to intended spending, that is, Y = C + I ==> Y = C* + cY + I* ==> (1 - c)Y = C* + I* ==> Y = [1/(1 - c)](C* + I*) = [1/(1 - c)]A*.But since S = YD - C = Y - [C* + cY] = - C* + (1 - c)Y,we can derive the same result fromS = I* ==> S = - C* + (1 - c)Y = I*==> (1 - c)Y = C* + I* ==> Y = [1/(1 - c)](C* + I*) = [1/(1 -c)]A* .7. In an effort to stimulate the economy in 1976, President Ford asked Congress for a $20 billiontax cut in combination with a $20 billion cut in government purchases. Do you consider this a good policy proposal? Why or why not?This is not a good policy proposal. According to the balanced budget theorem, equal decreases in government purchases and taxes will decrease rather than increase income. Therefore theintended result would not be achieved.8. Assume the following model of the expenditure sector:Sp = C + I + G + NX C = 420 + (4/5)YD YD = Y - TA + TR TA = (1/6)YTR o = 180 I o = 160 G o = 100 NX o = - 40(a) Assume the government would like to increase the equilibrium level of income (Y) to thefull-employment level Y*= 2,700. By how much should government purchases (G) be changed?(b) Assume we want to reach Y*= 2,700 by changing government transfer payments (TR)instead. By how much should TR be changed?(c) Assume you increase both government purchases (G) and taxes (TA) by the same lump sumof ?G = ?TA o= + 300. Would this change in fiscal policy be sufficient to reach the full-employment level of output at Y* = 2,700? Why or why not?(d) Briefly explain how a decrease in the marginal propensity to save would affect the size of theexpenditure multiplier.5a. Sp = C + I + G + NX = 420 + (4/5)[Y - (1/6)Y + 100] + 160 + 180 - 40= 720 + (4/5)(5/6)Y + 80 = 800 + (2/3)YFrom Y = Sp ==> Y = 800 + (2/3)Y ==> (1/3)Y = 800 ==>Y = 3*800 = 2,400==> the expenditure multiplier is α = 3From ?Y = α(?A o) ==> 300 = 3(?A o) ==> (?A o) = 100Thus government purchases should be changed by ?G = ?A o = 100.b. Since ?A o = 100 and ?A o = c(?TR o) ==>100 = (4/5)(?TR o) ==> ?TR o = 125.c. This is a model with income taxes, so the balanced budget theorem does not apply in its strictest form,which states that an increase in government purchases and taxes by a certain amount increases national income by that same amount, leaving the budget surplus unchanged. Here total tax revenue actually increases by more than 100, since taxes are initially increased by a lump sum of 100, but then income taxes also change due to the change in income. Thus income does not increase by ?Y = 300, as we can see below.Y = α(?G) + α[(-c)(αTA o) = 3*300 + 3*[-(4/5)300] = 900 - 720 = 180This change in fiscal policy will increase income by only ?Y = 180, from Y0 = 2,400 to Y1 = 2,580, and we will be unable to reach Y* = 2,700.d. If the marginal propensity to save decreases, people spend a larger portion of their additionaldisposable income, that is, the mpc and the slope of the [C+I+G+NX]-line increase. This will lead to an increase in the expenditure multiplier and equilibrium income.9. Assume a model with income taxes similar to the model in Problem 9 above. This time, however,you have only limited information about the model, that is, you only know that the marginal propensity to consume out of disposable income is c = 0.75, and that total autonomous spending is A o = 900, such that Sp = A o + c'Y = 900 + c'Y. You also know that you can reach the full-employment level of output at Y* = 3,150 by increasing government transfers by a lump sum of ?TR = 200.(a) What is your current equilibrium level?(b) Is it possible to determine the size of the expenditure multiplier with the information youhave?(c)Assume you want to change the income tax rate (t) in order to reach the full-employmentlevel of income Y* = 3,150. How would this change in the income tax rate affect the size of the expenditure multiplier?a. Since ?A = c(?TR) = (0.75)200 = 150,the new [C+I+G+NX]-line is of the form Sp1 = 1,050 + c1Y.For each model of the expenditure sector we can derive the equilibrium level of income by using the following equation: Y* = αA o = 1/(1-c’) ==> 3,150 = α1,050 ==> the expend iture multiplier is α = 3.If we now change autonomous spending by ?A = 150, then income will have to change by ?Y = α(?A) ==> ?Y = 3*150 = 450.Therefore the old equilibrium level of income must have been Y = 3,150 - 450 = 2,700.b. From our work above we can see that the size of the multiplier is α = 3.c. The new [C+I+G+NX]-line is of the form Sp2 = 900 + c2Y. This new intended spending line intersectsthe 45-degree line at Y = 3,150. Thus the slope of the new intended spending line can be derived as c2= (3,150 - 900)/(3,150) = 5/7.From Y = Sp2 ==> Y = 900 + (5/7)Y ==> (2/7)Y = 900 ==> Y = (7/2)900 = (3.5)900 = 3,150.6The new value of the multiplier is 3.5Sp3,1509002,700 3,150 Y10. Assume you have the following model of the expenditure sector:Sp = C + I + G + NX C = 400 + (0.8)YD I o = 200 G o = 300 + (0.1)(Y* - Y) YD = Y - TA + TR NX o = - 40 TA = (0.25)Y TR o =50(a) What is the size of the output gap if potential output is at Y* = 3,000?(b) By how much would investment (I) have to change to reach equilibrium at Y* = 3,000, andhow does this change affect the budget surplus?(c) From the model above you can see that government purchases (G) are counter-cyclical, thatis they are increased as national income decreases. If youcompare this specification of G with a constant level of G, how is the value of the expenditure multiplier affected?(d) Assume the equation for net exports is changes such that NX o = - 40 is now NX1 = - 40 - mY,with 0 < m < 1. How would this affect expenditure multiplier?a. Sp = 400 + (0.8)YD + 200 + 300 + (0.1)(3,000 - Y) - 40= 1,160 + (0.8)(Y - (0.25)Y + 50) - (0.1)Y = 1,200 + [(0.8)(0.75) - (0.1)]Y = 1,200 + (0.5)Y Y = Sp ==> Y = 1,200 + (0.5)Y ==> (0.5)Y = 1,200 ==>Y = 2*1,200 = 2,400The output gap is Y* - Y = 3,000 - 2,400 = 600.b. From ?Y = (mult.)(?A) ==> 600 = 2(?I) ==> ?I = 300BuS = TA - TR - G = (0.25)(2,400) - 50 - [300 + (0.1)(600)] = 600 - 50 - 300 - 60 = 190BuS* = (0.25)(3,000) - 50 - 300 = 400, so the budget surplus increases by ?BuS = 210.c. If government purchases are used as a stabilization tool, the size of the multiplier should be lower thanif the level of government spending is fixed. In the model of the expenditure sector above, the slope of the [C+I+G+NX]-line is c' = 0.5 compared to c" = 0.6, when government purchases were defined as G = 300.d.With this change, net exports decrease as national income increases. This additional leakage impliesthat the size of the multiplier will decrease. In the model above, the slope of the [C+I+G+NX]-line decreases from c' = (0.5) to c" = (0.5) - m. Therefore the expenditure multiplier will decrease from 1/[1 - (0.5)] to 1/[1 - (0.5) + m].711. Assume you have the following model of the expenditure sector:Sp = C + I + G + NX C = C o + cYD YD = Y - TA + TR TA = TA oTR = TR o I = I o G = G o NX = NX o(a) If a decrease in income (Y) by 800 leads to a decrease in savings (S) by 160, what is the sizeof the expenditure multiplier?(b) If a decrease in taxes (TA) by 400 leads to an increase in income (Y) by 1,200, how large isthe marginal propensity to save?(c) If an increase in imports by 200 (?NX = - 200) leads to a decrease in consumption (C) by800, what is the size of the expenditure multiplier?Recall that the expenditure multiplier for such a simple model can be calculated as:α = 1/(1 - c)a. (?S)/(?Y) = 1 - c = (-160)/(-800) = .2 ==> 1/(1 - c) = 1/(.2) = 5 ==> the multiplier is α = 5.b. From (?Y) = α[-c(?TA o)] ==> (?Y)/(?TA o) = (-c)α = (-c)/(1 - c) ==>(1,200)/(-400) = - 3 = (-c)/(1 - c) ==> -3(1 - c) = -c ==> c = 3/4==> mps = 1 - c = 1/4 = 0.25.c. ?Y = ?C + ?NX = -800 + (-200) = - 1,000==> c = (?C)/(?Y) = (-800)/(-1,000) = .8 ==> multiplier = α = 1/(1 - c) = 1/(.2) = 512. Explain why income taxation, the Social Security system, and unemployment insurance areconsidered automatic stabilizers.Income taxes, unemployment benefits, and the Social Security system are often called automatic stabilizers becausethey reduce the amount by which output changes as a result of a change in aggregate demand. These stabilizers are a part of the structure of the economy and therefore work without any actual government intervention. For example, when output declines and unemployment increases. If we had no unemployment insurance, people out of work would not receive any disposable income and then consumption would drop significantly. But since unemployed workers get unemployment compensation, consumption will not decrease as much. Therefore, aggregate demand may not be reduced by as much as it would have without these automatic stabilizers.13. Assume a simple model of the expenditure sector with a positive income tax rate (t). Showmathematically how an increase in lump sum taxes (TA o ) would affect the budget surplus. From BS = TA - G - TR = tY + TA o - G – TR==> ?BS = t(?Y) + ?TA o = t(mult.)(-c)(?TA o) + ?TA o= t[1/(1 - c + ct)](-c)(?TA o) + ?TA o = ([ -(ct) + 1 - c + (ct)]/[1 - c + (ct)])(?TA o)= (1 - c) /[1 - c + (ct)])(?TA o) > 0, since c < 1In other words, a lump sum tax increase would increase the budget surplus.14. True or false? Why?"A tax cut will increase national income and will therefore always increase the budget surplus." False. Although a tax cut raises national income, not all of the increase in income is spent, nor is it completely taxed away. Income tax revenues fall and the budget deficit rises. Assume the following model of the expenditure sector:Sp = C + I + G + NX I = I oC = C o + cYD G = G oYD = Y - TA +TR NX = NX oTA = TA o + tY BS = TA - G - TRTR = TR o8From Y = Sp ==> Y = C o + c(Y - TA o - tY + TR o) + I o + G o + NX o ==>Y = C o - cTA o + cTR o + I o + G o + NX o + c(1 - t)Y = A o + c'Y ==>Y = [1/(1 - c')]A o with c' = c (1- t)Thus ?Y = [1/(1 - c')][(-c)(?TA o)]and ?BS = t(?Y) + (?TA o) = {[t(-c)]/(1 - c') + 1}(?TA o) ==> = {[-(ct) + 1 - c + (ct)]/[1 - c + (ct)]}(?TA o) = {(1 - c)/[1 - c + (ct)]}(?TA o) > 0 if ?TA > 0. Therefore, if taxes fall, that is, if ?TA < 0, the budget surplus decreases.15. Assume a simple model of the expenditure sector with a positive income tax rate (t). Showmathematically how a decrease in autonomous investment (I o ) would affect the budget surplus.A decrease in autonomous investment (I o) will have a multiplier effect and will therefore decrease national income and tax revenue. The budget surplus will decrease as shown below: ?BS = t(?Y) = tα(?I o) < 016. "An increase in government purchases will always pay for itself, as it raises national income andhence the government's tax revenues." Comment on this statement.An increase in government purchases will increase the budget deficit. If we assume a model of the expenditure sectorwith income taxes, then the multiplier equals [1/(1 - c')] with c' = c (1- t). The change in the budget surplus that arises from a change in government purchases can be calculated as ?BS = t(?Y) - ?G = t[1/(1 - c')](?G) - ?G = {[t - 1 + c - (ct)]/[1 - c + (ct)]}(?G) = - {[(1 - c)(1 - t)]/(1 - c + (ct)]}(?G) < 0, sine ?G > 0.Therefore, if government purchases are increased, the budget surplus will decrease.17. Is the size of the actual budget surplus always a good measure for determining fiscal policy?What about the size of the full-employment budget surplus?The actual budget surplus has a cyclical and a structural component. The cyclical component of the budget surplus changes with changes in the level of income whether or not any fiscal policy measure has been implemented. This implies that the actual budget surplus also changes with changes in income and is therefore not a very good measure for assessing fiscal policy. The structural (full-employment) budget surplus is calculated under the assumption that the economy is at full-employment. It therefore changes only with a change in fiscal policy and is a much better measure for fiscal policy than the actual budget surplus. One should keep in mind, however, that the balanced budget theorem implies that the government can stimulate national income by an equivalent and simultaneous increase in taxes and government purchases, thereby affecting the actual or the full-employment budget surplus.18. Assume a model of the expenditure sector with income taxes, in which people who pay taxes,have a higher marginal propensity to consume than people who receive government transfers, and the consumption function is of the following form: C = C o + c(Y - TA) + dTR, withc < d.(a) What will happen to the equilibrium level of income and the budget surplus if governmentpurchases are reduced by the same lump sum amount as taxes?(b) W hat will happen to the equilibrium level of income and the budget surplus if governmenttransfers are reduced by the same lump sum amount as taxes?a. Assume that ?TA o = ?G = - 100 ==>Y = [(-c)/(1 - c')(?TA o) + [1/(1 - c')](?G) = [(1 - c)/(1 - c')](-100) < 0 c' = c(1 - t)National income would decrease.BS = t(?Y) + ?TA o - ?G = t(?Y) < 09The budget surplus would decrease by the loss in income tax revenue.b. Assume that ?TA o = ?TR o = - 100 ==>Y = [(-c)/(1 - c')](?TA o) + [d/(1 - c')](?TR o) = [(d - c)/(1 - c')](-100) < 0 c' = c(1 - t)National income would increase.BS = t(?Y) + ?TA o - ?TR o = t(?Y) < 0The budget surplus would decrease.19. True or false? Why?"The higher the marginal propensity to import, the lower the size of the multiplier."True. Imports represent a leakage out of the income flow. An increase in autonomous spending will raise income and we will see the usual multiplier effect. However, if imports are positively related to income, this effect is reduced since higher imports reduce the level of domestic demand.Closed Economy Model Open Economy ModelSp = C + I + G Sp = C + I + G + NXC = C o + cY C = C o + cYG = G o G = G oI = I o I = I oNX = NX o - mY with m > 0From Y = Sp ==>Y = (C o + I o + G o) + cY Y = (C o + I o + G o + NX o) + (c - m)YY = A o + cY Y = A o + (c - m)YY = [1/(1 - c)]A o Y = [1/(1 - c + m)]A oTherefore the multiplier is defined as[1/(1 - c)] [1/(1 - c + m)]Clearly the open economy multiplier falls short of the closed economy multiplier. This is because leakages reduce demand. If income taxes were included in these models, they too would reduce the multipliers, as income taxes represent another leakage from the income flow.10。
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Chapter 22. Assume a German tourist buys a Mexican beer in a pub in Houston, Texas. How will the U.S. GDP be affected? CA.U.S. GDP will be unaffected, since a foreigner buys a foreign product.B. U.S. GDP will decrease since the beer has to be imported from MexicoC. U.S. GDP will increase by the value added at the Houston pubD. U.S. GDP will increase, but only by the sales tax assessed on the beer7. If nominal GDP is $10,406 billion and the GDP-deflator is 110, then real GDP is about $9,460 billion8. The GDP-deflator and the CPI differ from each other since CA. the GDP-deflator does not include services but the CPI doesB. the GDP-deflator includes imported goods but the CPI doesn'tC. the CPI measures a fixed market basket but the GDP-deflator doesn'tD. the CPI includes more goods than the GDP-deflator does9. Assume you desire a real rate of return of 4% on an investment and you expect the annual average inflation rate to be 3.2%. What should the nominal interest rate be on this investment? 7.2%Chapter 93. Assume a model with no government and no foreign sector. If the consumption function is defined as C = 800 + (0.8)Y, and the income level is Y = 2,000, then the level of total saving is -4004. Assume a model with no government and no foreign sector. If we have a savings function that is defined as S = - 200 + (0.1)Y and autonomous investment decreases by 50, by how much will consumption change? -4505. Assume a model without income taxation and no foreign sector. If government purchases are increased by $25 billion financed by a lump sum tax increase of $25 billion, then AA. national income will increase by $25 billion but the budget deficit is unaffectedB. national income will increase $50 billion but the budget deficit is unaffectedC. neither national income nor the budget deficit will be affectedD. we cannot say for sure what will happen to national income or the budget deficit6. The size of the expenditure multiplier increases with an increase in CA. government transfer paymentsB. the marginal propensity to saveC. marginal propensity to consumeD. the income tax rate7. Assume the savings function is S = - 200 + (1/4)YD and the marginal tax rate is t = 20%. If the level of government spending increases by 100, by how much will the level of equilibrium income change? 2508. Assume a model of the expenditure sector with income taxes. If the level of autonomous investment decreases (due to negative business expectations), which of the following will be true? DA. the actual budget surplus will not be affectedB. the actual budget surplus will increaseC. the structural budget surplus will decreaseD. the cyclical component of the budget surplus will decrease9. Assume the consumption function is C = 600 + (3/4)YD and the income tax rate is t = 20%. What will be the effect on the actual budget surplus of an increase in autonomous investment by 200? an increase by 10010. Assume the consumption function is C = 200 + (0.8)YD and the income tax rate is t = 0.25. What will be the eff ect of an increase in government transfers by ΔTR = 100 on the full-employment budget surplus? an decrease by 100Chapter 104.哪些政策会使IS曲线变陡峭并向左移动?DA.货币供应量的减少B.政府转移支付的减少C.一笔税收的减少D.所得税率的减少5.LM曲线左上方表示DA.商品和服务的过度需求B.商品和服务的过度供给C.货币的过度需求D.货币的过度供给6.LM曲线会在什么情况下变平坦?BA.货币需求对利率变化的敏感度低B.货币需求对收入变化敏感度低C.货币需求对收入变化敏感度高D.货币政策乘数变大7.在IS-LM模型中,如果自主储蓄增加会导致收入和利率均减少8. 在IS-LM框架下,扩张性货币政策会增加消费和投资9.沿着AD曲线从左向右运动相当于BA.由于利率下降,IS右移B.由于实际货币余额增加,LM右移C.由于增加名义货币供给量,LM右移D.由于较低的实际货币余额,沿着LM曲线从左向右移动10.什么情况下AD曲线右移 AA.政府转移支付增加B.由于价格水平下降,实际货币余额增加C.自主储蓄增加D.央行限制名义货币供给量Chapter 111. 在美国,扩张性货币政策常以下方式进行:C A.财政部发行新债券来融资增加预算赤字B. 美联储要求银行增加贷款活动C. 美联储从银行或政府安全经销商那购买债券,以换取金钱D.美联储乡政府出售债券4.扩张性财政政策的副作用利率上升会导致国内生产总值的组成发生变化5.如果央行固定汇率BA.每次财政扩张后要承担公开市场销售B.每次IS曲线变动时,央行都要调整货币供给C.财政政策变化不会影响消费和投资D.上述所有6.挤出指的是CA.当所得税提高时,消费水平降低B.投资补贴减少后,投资水平降低C.财政政策的变化通过改变利率影响GDP的构成D.流动性陷阱时,财政政策完全无效8. 如果政府通过投资补贴刺激经济,BA. 投资和产出水平会增加,但消费将不受影响B. 投资增长的一部分会通过提高利率来抵消C. 可避免增加利率D. 央行的帮助下仍然必要的,因为补贴不会使利率上升10. 如果央行拒绝大量增加政府支出,最可能的结果将是A.由于利率改变,国际收支的经常账户出现盈余B.由于利率改变,消费水平下降C.GDP组成发生变化D.上述所有Chapter 122. Which of the following items is a surplus item in the balance of payments for the United Sates?A. a U.S. car dealer buys 20 BMWs from Germany and sells them at a profit in the U.S.B. a U.S. citizen deposits funds in a bank in the BahamasC. a German firm pays to get a license for the use of American technologyD. Bill Gates buys himself a small island off the coast of Indonesia4. 如果美国商品的价格水平为P = 110,外国商品的价格水平为P f = 220,名义汇率为e=1.2,真正汇率为 2.46. The concept of relative purchasing power parity implies thatA. the real exchange rate adjusts slowly to its long-run average levelB. the domestic price level will change rapidly until the real exchange rate is equal to 1C. the relative demand for domestic goods will rise if the real exchange rate is below 1D. the long-run relative price level of domestic to foreign goods (P/P f) is equal to 17. Restrictive monetary policy in the U.S.A. lowers the value of the U.S. dollar relative to other currenciesB. increases the value of the U.S. dollar relative to other currenciesC. increases U.S. net exportsD. should not have any effect on the U.S. trade balance9. In a model with flexible exchange rates and perfect capital mobility, restrictive fiscal policy is likely to causeA. an appreciation of the domestic currencyB. a decrease in the current account surplusC. an increase in net exportsD. an inflow of funds10. A country that follows a beggar-thy-neighbor policyA. induces an exchange rate depreciation to increase domestic output via monetary policyB. uses fiscal policy to increase its competitiveness on world marketsC. imposes a tariff on imported goodsD. tries to benefit from an increase in world demand by selling domestic products at higher pricesChapter 52.The Keynesian AS-curve implies thatA) the economy is always at the full-employment level of outputB) the AS-curve is completely verticalC) wages and prices are completely flexibleD) a change in spending will affect the level of GDP but not the price level3 In the Keynesian AS-curve case, if the government cuts welfare payments, thenA) the price level will decrease, but the economy will remain at the full-employment level of outputB) the level of output will decrease but the price level will remain the sameC) the levels of output and prices will decreaseD) unemployment will increase, since wages and prices are completely flexible4.The slope of the AS-curve becomes steeperA) as wages and prices become more flexibleB) as wages become more rigidC) as the economy moves further away from full employmentD) as the government implements expansionary fiscal policy5.If the unemployment rate is assumed to be at its natural rate, thenA) inflation cannot existB) the unemployment rate is zeroC) the unemployment rate is positive but at a level that exists when GDP is at its potential levelD) all unemployment is cyclical in nature6.In the medium run, an increase in oil prices willA) increase the price level but reduce the level of outputB) lead to a decrease in aggregate demandC) lead to an increase in aggregate demandD) not affect the level of real output10.As potential GDP grows over timeA) the level of output is essentially determined by shifts in the vertical AS-curveB) the price level remains constantC) the AD-curve shifts to the right due to a change in the average price levelD) the level of actual output can only change if the AD-curve shifts accordinglyChapter 65.The coordination approach to the Phillips curve focuses on the fact thatA) fiscal and monetary policies often are uncoordinatedB) firms are reluctant to change wages and prices because they aren't sure what their competitors will doC) workers are well informed about changes in their nominal wages but not about changes in their real wagesD) anticipated changes in monetary policy have no significant effect on the unemployment rate7.Which of the following equations best describes Okun's law?A) (Y - Y*) = 0.5(u - u*)B) (Y - Y*)/ Y* = - 2(u - u*)C) (Y* - Y) = 2(u - u*)D) (Y* - Y)/Y = - 0.5(u - u*)9.Which of the following is the most likely result of an unanticipated increase in money supply?A) higher prices and output in the medium run but no change in output in the long runB) higher prices and lower real money balances in both the medium and the long runC) higher prices and employment in the medium run, but no change in output and prices in the long runD) higher prices and output in the medium and long runs10.If the government employs restrictive monetary policy in response to an adverse supply shock,A) the inflation rate and the natural rate of unemployment will both decreaseB) the rate of unemployment will increase sharplyC) unemployment will remain at its natural levelD) the shift in the AS-curve can be reversed almost immediatelyChapter 33.If we assume a Cobb-Douglas production function where the share of labor is 3/4 and the share of capital is 1/4, then the marginal product of capital can be calculated asA) 3Y/4KB) Y/4KC) 4Y/KD) Y/K5.Assume a Cobb-Douglas aggregate production function in which labor's share of income is 0.7 and capital's share of income is 0.3. At what rate will real output grow if labor grows at2.0%, the capital stock grows at 1.0%, and total factor productivity increases by 1.8%?A) 4.8%B) 3.5%C) 3.0%D) 1.8%6.In the neoclassical growth model, a decrease in the savings rateA) raises the growth rate of output per capitaB) lowers the growth rate of output per capitaC) raises the steady-state capital-labor ratioD) lowers the steady-state capital-labor ratio7.In the neoclassical growth model, a decrease in the rate of population growth willA) decrease the growth rate of outputB) decrease the level of output per capitaC) decrease the steady-state capital-labor ratioD) all of the above8.In the neoclassical growth model, a one-time increase in technology willA) increase the growth rate of outputB) shift the investment requirement line upC) increase the steady-state capital-labor ratioD) all of the aboveChapter 41.Constant returns to scale for capital alone implies thatA) as both capital inputs and labor inputs are doubled, output will more than doubleB) as both capital inputs and labor inputs are doubled, output will less than doubleC) as both capital inputs and labor inputs are doubled, output will doubleD) as capital inputs are doubled, output will less than double2.Paul Romer's notion of social returns to capital implies thatA) the contribution of any new knowledge will not just go to the producer of new knowledge but be shared by others as wellB) new capital investments have a bigger impact on growth if the owners of capital share their newfound wealth with the poorC) investment in real capital benefits society as a whole while investment in human capital only benefits those who invest in themselvesD) investment in real capital has a bigger impact on labor productivity than investment in human capital3.The distinction between private and social returns to capital is important sinceA) policy makers want to know how much the government can gain from capital investmentsB) capital investments cannot be undertaken profitably unless subsidized by the governmentC) capital investments often have important spillover effectsD) capital investment increases labor productivity4.Assume an endogenous growth model with labor augmenting technology and a production function of the form Y = F(K,AN), with A = 2(K/N) such that y = 2k. If the rate of population growth is n = 0.03, the rate of depreciation is d = 0.04, and the savings rate is s = 0.08, the growth rate of output per capita isA) 15%B) 9%C) 7%D) 1%5.Assume an endogenous growth model with labor augmenting technology and a production function of the form Y = F(K,AN), with A = 1.2(K/N) such that y = 1.2k. If the rate of population growth is n = 0.03, the rate of depreciation is d = 0.05, how large would the savings rate (s) have to be to achieve a per-capita growth rate of output of 4 percent?A) 12%B) 10%C) 8%D) 4%6.Assume an aggregate production function with a constant marginal product of capital and with capital as the only factor of production, such that Y = aK. If there is neither population growth nor depreciation of capital, the growth rate of per-capita output isA) Δy/y = saB) Δy/y = sa + (n - d)C) Δy/y = sa + (n + d)D) Δy/y = sa/(n + d)7.The idea that increased investment in research and development will enhance economic growth isA) the key to linking higher savings rates to higher equilibrium growth ratesB) totally unprovenC) a crucial element of conditional convergenceD) an important part of the neoclassical growth model8.Conditional convergence is predicted for two countries with the same population growth and access to the same technology. This means that they will eventuallyA) reach the same income per capita and the same economic growth rate even if they have different savings ratesB) reach a different income per capita but the same economic growth rate even if they have different savings ratesC) reach the same income per capita and different economic growth rates if they have different savings ratesD) reach different income per capita levels and different economic growth rates if they have different savings rates9.Endogenous growth theory predicts that countries will achieve higher economic growth rates if they manage toA) lower their population growthB) increase their savings ratesC) shield their industries from foreign competitionD) all of the above10.The four "Asian Tigers" achieved their economic growth between 1966 and 1990 mostly throughA) population controlB) protection of domestic industries from foreign competitionC) hard work and sacrificeD) a large degree of government interventionChapter 131.Keynes' theory of consumption behavior largely relied on the equation C = Co + cY. This equation implies that the value of the average propensity to consumeA) increases as the economy goes into a recessionB) increases as the economy goes into a boomC) remains constant whether the economy goes into a boom or a recessionD) is always lower than the value of the marginal propensity to consume2.Assume a worker at age 30 with no wealth and an expected average annual earnings of $50,000, who wants to retire at age 65 and expects to live until age 80. According to the life-cycle hypothesis what dollar amount does that person consume annually?A) $45,000B) $40,000C) $35,000D) $30,0003.If we divide consumption expenditures into the purchases of non-durable goods and the purchases of durable goods, we realize thatA) the life-cycle and permanent-income theories apply much more to the consumption of non-durable goods than durable goodsB) the consumption of non-durable goods is much more interest sensitive than the consumption of durable goodsC) the consumption of non-durable goods is more strongly affected by a surprise change in income than the consumption of durable goodsD) the consumption of durable goods this year is largely the same as the consumption of durable goods last year4.According to the permanent-income theory of consumptionA) the short-run multiplier is identical to the long-run multiplierB) the short-run multiplier is larger than the long-run multiplierC) the short-run mpc is larger than the long-run mpcD) the short-run mpc is smaller than the long-run mpc5.According to the permanent-income hypothesisA) increases in current income lead to large increases in current consumptionB) current consumption is not significantly affected by a temporary change in incomeC) the mpc out of transitory income is greater than the mpc out of permanent incomeD) increases in the interest rate will affect consumption negatively6.The random-walk theory of consumptionA) clearly contradicts the permanent-income theoryB) predicts that current consumption is most strongly affected by current incomeC) predicts that this year's consumption is most strongly affected by last year's consumptionD) does not support the notion that people have rational expectations7.The fact that consumption exhibits "excess smoothness" implies thatA) consumption responds too strongly to surprise changes in incomeB) current consumption can be predicted based on changes in current incomeC) changes in transitory income have no effect on current consumption or savingD) none of the above8.If we account for liquidity constraints,A) we can explain why a temporary tax increase may have an effect on current consumptionB) we have to discard the permanent-income hypothesisC) consumption becomes much more interest sensitiveD) consumption responds much less severely to surprise changes in income9.Household savings behavior tends to be fairly interest inelastic, which can be largely explained byA) a very large substitution effectB) the fact that the income effect dominates the substitution effectC) the fact that the substitution effect is largely offset by the income effectD) the fact that the consumption of durable goods tends to be very interest inelastic10.Which of the following is an objection to the Barro-Ricardo proposition?A) people believe that debt-financing merely postpones taxationB) people who benefit from a tax cut now are often not the same people who pay higher taxes laterC) a tax cut may ease a person's liquidity constraints, inducing the person to consume moreD) most people can borrow funds when necessary and therefore always consume according to their permanent incomeChapter 141Which of the following will NOT affect the productive capacity of a country?A) more people getting a higher educationB) more people investing in government bondsC) the government improving the infrastructure such as bridges and highwaysD) firms replacing old PCs with newer, more efficient ones2In absence of taxation, the rental cost of capital can be defined asA) rc = i + πe - dB) rc = i - πe - dC) rc = i - πe + dD) rc = i + πe + d3If we ignore taxation and know that the rental cost of capital is 12%, the expected rate of inflation is 4%, and the nominal interest rate is 9%, we can conclude that the rate of depreciation must beA) d = 1%B) d = 7%C) d = 17%D) d = 25%4If the rental cost of capital is above the marginal product of capital, then a firm shouldA) increase its investment spendingB) decrease its investment spendingC) not replace some of the machines that have broken down in the production processD) undertake primarily replacement investments5Assume a Cobb-Douglas production function of the form Y = AK0.2N0.8. If the rental cost of capital is rc = 5%, the desired capital stock of a cost-minimizing firm should be equal toA) K* = 2YB) K* = 4YC) K* = 5YD) K* = 8Y6Assume the market interest rate is 10% and is not expected to change over the next three years. If an investment project has net returns of $2,420 after one year, $3,630 after the second year, and $3,993 after the third year, what is its net present discounted value?A) $10,043B) $9,130C) $9,020D) $8,2007The most likely source of funding for a U.S. firm wishing to finance a new investment project isA) a credit line with a bankB) retained earningsC) selling bondsD) issuing equity (stocks)8According to the accelerator model,A) a change in investment is proportional to the level of outputB) the level of investment spending is proportional to the level of outputC) the level of investment spending is proportional to the change in outputD) the level of investment spending is mainly affected by interest rate changes9Expansionary monetary policy has an effect on the housing market since itA) decreases the price of all assets, including housing pricesB) lowers real interest rates in the long run, so people will postpone buying homesC) lowers nominal interest rates, so banks find mortgage lending less profitableD) lowers nominal interest rates, so more homebuyers are able to qualify for mortgages10An unanticipated decrease in the level of inventories may occurA) in the midst of a boom, as firms prepare for the upcoming recessionB) in a boom when increased sales cannot be met by increases in productionC) in a recession when firms expect lower profits and try to keep their costs lowD) at the beginning of a recession as firms slash their prices to induce more salesChapter 151.As credit and debit cards are more widely used, we should expect thatA) more money balances will be held in M1B) more money balances will be held in M2C) less money balances will be held in M2D) less money balances will be held in M1, but those held in M2 will remain unchanged 2Which of the following would lead to increased money balances in M1?A) more purchases made on the internetB) more credit card purchasesC) lower inflationary expectationsD) all of the above3A financial asset is considered less liquid ifA) it has a longer maturityB) it is issued by the government rather than a large corporation such as MicrosoftC) it earns a lower yieldD) none of the above4The Baumol-Tobin square-root formula for money demand applies primarily toA) the transactions motive of holding moneyB) the precautionary motive of holding moneyC) the speculative motive of holding moneyD) the store-of-value motive of holding money5According to the Baumol-Tobin square-root formula, the amount of money balances held for transaction willA) increase as interest rates increaseB) decrease as the cost of money transactions increasesC) increase less than proportionately to increases in incomeD) all of the above6The speculative demand for moneyA) will always increase proportionately to the precautionary demand for moneyB) will always increase proportionately to the transactions demand for moneyC) is affected by changes in bond yields but not equity yieldsD) cannot be easily separated from money demand for transaction or precaution7If the expected growth rate in real GDP for next year is 2.5%, we can anticipate that the demand for M1 money holdings willA) also increase by 2.5%B) increase by more than 2.5%C) increase by less than 2.5%D) remain constant8The income velocity of money is defined asA) real money supply divided by real GDPB) nominal money supply divided by nominal GDPC) nominal GDP divided by nominal money supplyD) national income divided by the currency outstanding9If the government increases the level of government purchases, we can expect thatA) interest rates and the income velocity of money will both increaseB) interest rates and the income velocity of money will both decreaseC) interest rates will increase but the income velocity of money will decreaseD) interest rates will increase but the income velocity of money will remain the same 10According to the quantity theory of money, in the long runA) the behavior of velocity is hard to predictB) a change in money supply will be followed by a proportional change in the price levelC) an increase in nominal money supply will result in a proportional decrease in velocityD) an increase in nominal money supply will result in a proportional increase in velocity。