ch13
Ch13 简单国民收入决定理论
第十三章 简单国民收入决定理论
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生命周期理论和永久收入理论的共同点
1、消费不只同现期收入相联系,而是以一生或永久 的收入作为消费决策的依据。
2、一次性暂时收入变化引起的消费支出变动甚小, 即其边际消费倾向很低,甚至近于零,但来自永久收 入变动的边际消费倾向很大,甚至近于1。 3、当政府想用税收政策影响消费时,如果减税或增 税只是临时性的,则消费并不会受到很大影响,只有 永久性税收变动,政策才会有明显效果。
响,这就是所谓“示范效应”。
第十三章 简单国民收入决定理论
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相对收入消费理论对短期消费函数的解释
CL=βy C CS2 Ct1 CS1 O Yt1 Y1 Y2 Y C2
C1
第十三章 简单国民收入决定理论
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二、生命周期的消费理论
【美●弗朗科.莫迪利安】
弗朗科.莫迪利安的生命周期的消费理论强调人们
c dc c lim MPC y y 0 y dy
第十三章 简单国民收入决定理论
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中国改革开放后居民消费倾向的变动
改革开放政策使居民的可支配收入迅速增加。随
着收入水平的快速提高,中国居民的消费倾向发生了 显著变化。在1988年中国居民平均消费倾向还在90%以 上,此后,平均消费倾向开始明显下降,1995年比 1988年平均消费倾向降低了16个百分点。与此同时,边 际消费倾向也明显下降,到1994年,边际消费倾向降 到64%。
平均储蓄倾向和边际储蓄倾向都是递增的, 且边际储蓄倾向大 简单国民收入决定理论
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如果储蓄和收入之间存在线性关系, 因为 s=y-c , 且c=α+βy , 所以: s=y-(α+βy)= -α+(1–β)y
计量经济学导论CH13习题答案
CHAPTER 13TEACHING NOTESWhile this chapter falls under “Advanced Topics,” most of this chapter requires no more sophistication than the previous chapters. (In fact, I would argue that, with the possible exception of Section 13.5, this material is easier than some of the time series chapters.)Pooling two or more independent cross sections is a straightforward extension of cross-sectional methods. Nothing new needs to be done in stating assumptions, except possibly mentioning that random sampling in each time period is sufficient. The practically important issue is allowing for different intercepts, and possibly different slopes, across time.The natural experiment material and extensions of the difference-in-differences estimator is widely applicable and, with the aid of the examples, easy to understand.Two years of panel data are often available, in which case differencing across time is a simple way of removing g unobserved heterogeneity. If you have covered Chapter 9, you might compare this with a regression in levels using the second year of data, but where a lagged dependent variable is included. (The second approach only requires collecting information on the dependent variable in a previous year.) These often give similar answers. Two years of panel data, collected before and after a policy change, can be very powerful for policy analysis. Having more than two periods of panel data causes slight complications in that the errors in the differenced equation may be serially correlated. (However, the traditional assumption that the errors in the original equation are serially uncorrelated is not always a good one. In other words, it is not always more appropriate to used fixed effects, as in Chapter 14, than first differencing.) With large N and relatively small T, a simple way to account for possible serial correlation after differencing is to compute standard errors that are robust to arbitrary serial correlation and heteroskedasticity. Econometrics packages that do cluster analysis (such as Stata) often allow this by specifying each cross-sectional unit as its own cluster.108SOLUTIONS TO PROBLEMS13.1 Without changes in the averages of any explanatory variables, the average fertility rate fellby .545 between 1972 and 1984; this is simply the coefficient on y84. To account for theincrease in average education levels, we obtain an additional effect: –.128(13.3 – 12.2) ≈–.141. So the drop in average fertility if the average education level increased by 1.1 is .545+ .141 = .686, or roughly two-thirds of a child per woman.13.2 The first equation omits the 1981 year dummy variable, y81, and so does not allow anyappreciation in nominal housing prices over the three year period in the absence of an incinerator. The interaction term in this case is simply picking up the fact that even homes that are near the incinerator site have appreciated in value over the three years. This equation suffers from omitted variable bias.The second equation omits the dummy variable for being near the incinerator site, nearinc,which means it does not allow for systematic differences in homes near and far from the sitebefore the site was built. If, as seems to be the case, the incinerator was located closer to lessvaluable homes, then omitting nearinc attributes lower housing prices too much to theincinerator effect. Again, we have an omitted variable problem. This is why equation (13.9) (or,even better, the equation that adds a full set of controls), is preferred.13.3 We do not have repeated observations on the same cross-sectional units in each time period,and so it makes no sense to look for pairs to difference. For example, in Example 13.1, it is veryunlikely that the same woman appears in more than one year, as new random samples areobtained in each year. In Example 13.3, some houses may appear in the sample for both 1978and 1981, but the overlap is usually too small to do a true panel data analysis.β, but only13.4 The sign of β1 does not affect the direction of bias in the OLS estimator of1whether we underestimate or overestimate the effect of interest. If we write ∆crmrte i = δ0 +β1∆unem i + ∆u i, where ∆u i and ∆unem i are negatively correlated, then there is a downward biasin the OLS estimator of β1. Because β1 > 0, we will tend to underestimate the effect of unemployment on crime.13.5 No, we cannot include age as an explanatory variable in the original model. Each person inthe panel data set is exactly two years older on January 31, 1992 than on January 31, 1990. This means that ∆age i = 2 for all i. But the equation we would estimate is of the form∆saving i = δ0 + β1∆age i +…,where δ0 is the coefficient the year dummy for 1992 in the original model. As we know, whenwe have an intercept in the model we cannot include an explanatory variable that is constant across i; this violates Assumption MLR.3. Intuitively, since age changes by the same amount for everyone, we cannot distinguish the effect of age from the aggregate time effect.10913.6 (i) Let FL be a binary variable equal to one if a person lives in Florida, and zero otherwise. Let y90 be a year dummy variable for 1990. Then, from equation (13.10), we have the linear probability modelarrest = β0 + δ0y90 + β1FL + δ1y90⋅FL + u.The effect of the law is measured by δ1, which is the change in the probability of drunk driving arrest due to the new law in Florida. Including y90 allows for aggregate trends in drunk driving arrests that would affect both states; including FL allows for systematic differences between Florida and Georgia in either drunk driving behavior or law enforcement.(ii) It could be that the populations of drivers in the two states change in different ways over time. For example, age, race, or gender distributions may have changed. The levels of education across the two states may have changed. As these factors might affect whether someone is arrested for drunk driving, it could be important to control for them. At a minimum, there is the possibility of obtaining a more precise estimator of δ1 by reducing the error variance. Essentially, any explanatory variable that affects arrest can be used for this purpose. (See Section 6.3 for discussion.)SOLUTIONS TO COMPUTER EXERCISES13.7 (i) The F statistic (with 4 and 1,111 df) is about 1.16 and p-value ≈ .328, which shows that the living environment variables are jointly insignificant.(ii) The F statistic (with 3 and 1,111 df) is about 3.01 and p-value ≈ .029, and so the region dummy variables are jointly significant at the 5% level.(iii) After obtaining the OLS residuals, ˆu, from estimating the model in Table 13.1, we run the regression 2ˆu on y74, y76, …, y84 using all 1,129 observations. The null hypothesis of homoskedasticity is H0: γ1 = 0, γ2= 0, … , γ6 = 0. So we just use the usual F statistic for joint significance of the year dummies. The R-squared is about .0153 and F ≈ 2.90; with 6 and 1,122 df, the p-value is about .0082. So there is evidence of heteroskedasticity that is a function of time at the 1% significance level. This suggests that, at a minimum, we should compute heteroskedasticity-robust standard errors, t statistics, and F statistics. We could also use weighted least squares (although the form of heteroskedasticity used here may not be sufficient; it does not depend on educ, age, and so on).(iv) Adding y74⋅educ, , y84⋅educ allows the relationship between fertility and education to be different in each year; remember, the coefficient on the interaction gets added to the coefficient on educ to get the slope for the appropriate year. When these interaction terms are added to the equation, R2≈ .137. The F statistic for joint significance (with 6 and 1,105 df) is about 1.48 with p-value ≈ .18. Thus, the interactions are not jointly significant at even the 10% level. This is a bit misleading, however. An abbreviated equation (which just shows the coefficients on the terms involving educ) is110111kids= -8.48 - .023 educ + - .056 y74⋅educ - .092 y76⋅educ(3.13) (.054) (.073) (.071) - .152 y78⋅educ - .098 y80⋅educ - .139 y82⋅educ - .176 y84⋅educ .(.075) (.070) (.068) (.070)Three of the interaction terms, y78⋅educ , y82⋅educ , and y84⋅educ are statistically significant at the 5% level against a two-sided alternative, with the p -value on the latter being about .012. The coefficients are large in magnitude as well. The coefficient on educ – which is for the base year, 1972 – is small and insignificant, suggesting little if any relationship between fertility andeducation in the early seventies. The estimates above are consistent with fertility becoming more linked to education as the years pass. The F statistic is insignificant because we are testing some insignificant coefficients along with some significant ones.13.8 (i) The coefficient on y85 is roughly the proportionate change in wage for a male (female = 0) with zero years of education (educ = 0). This is not especially useful since we are not interested in people with no education.(ii) What we want to estimate is θ0 = δ0 + 12δ1; this is the change in the intercept for a male with 12 years of education, where we also hold other factors fixed. If we write δ0 = θ0 - 12δ1, plug this into (13.1), and rearrange, we getlog(wage ) = β0 + θ0y85 + β1educ + δ1y85⋅(educ – 12) + β2exper + β3exper 2 + β4union + β5female + δ5y85⋅female + u .Therefore, we simply replace y85⋅educ with y85⋅(educ – 12), and then the coefficient andstandard error we want is on y85. These turn out to be 0ˆθ = .339 and se(0ˆθ) = .034. Roughly, the nominal increase in wage is 33.9%, and the 95% confidence interval is 33.9 ± 1.96(3.4), or about 27.2% to 40.6%. (Because the proportionate change is large, we could use equation (7.10), which implies the point estimate 40.4%; but obtaining the standard error of this estimate is harder.)(iii) Only the coefficient on y85 differs from equation (13.2). The new coefficient is about –.383 (se ≈ .124). This shows that real wages have fallen over the seven year period, although less so for the more educated. For example, the proportionate change for a male with 12 years of education is –.383 + .0185(12) = -.161, or a fall of about 16.1%. For a male with 20 years of education there has been almost no change [–.383 + .0185(20) = –.013].(iv) The R -squared when log(rwage ) is the dependent variable is .356, as compared with .426 when log(wage ) is the dependent variable. If the SSRs from the regressions are the same, but the R -squareds are not, then the total sum of squares must be different. This is the case, as the dependent variables in the two equations are different.(v) In 1978, about 30.6% of workers in the sample belonged to a union. In 1985, only about 18% belonged to a union. Therefore, over the seven-year period, there was a notable fall in union membership.(vi) When y85⋅union is added to the equation, its coefficient and standard error are about -.00040 (se ≈ .06104). This is practically very small and the t statistic is almost zero. There has been no change in the union wage premium over time.(vii) Parts (v) and (vi) are not at odds. They imply that while the economic return to union membership has not changed (assuming we think we have estimated a causal effect), the fraction of people reaping those benefits has fallen.13.9 (i) Other things equal, homes farther from the incinerator should be worth more, so δ1 > 0. If β1 > 0, then the incinerator was located farther away from more expensive homes.(ii) The estimated equation islog()price= 8.06 -.011 y81+ .317 log(dist) + .048 y81⋅log(dist)(0.51) (.805) (.052) (.082)n = 321, R2 = .396, 2R = .390.ˆδ = .048 is the expected sign, it is not statistically significant (t statistic ≈ .59).While1(iii) When we add the list of housing characteristics to the regression, the coefficient ony81⋅log(dist) becomes .062 (se = .050). So the estimated effect is larger – the elasticity of price with respect to dist is .062 after the incinerator site was chosen – but its t statistic is only 1.24. The p-value for the one-sided alternative H1: δ1 > 0 is about .108, which is close to being significant at the 10% level.13.10 (i) In addition to male and married, we add the variables head, neck, upextr, trunk, lowback, lowextr, and occdis for injury type, and manuf and construc for industry. The coefficient on afchnge⋅highearn becomes .231 (se ≈ .070), and so the estimated effect and t statistic are now larger than when we omitted the control variables. The estimate .231 implies a substantial response of durat to the change in the cap for high-earnings workers.(ii) The R-squared is about .041, which means we are explaining only a 4.1% of the variation in log(durat). This means that there are some very important factors that affect log(durat) that we are not controlling for. While this means that predicting log(durat) would be very difficultˆδ: it could still for a particular individual, it does not mean that there is anything biased about1be an unbiased estimator of the causal effect of changing the earnings cap for workers’ compensation.(iii) The estimated equation using the Michigan data is112durat= 1.413 + .097 afchnge+ .169 highearn+ .192 afchnge⋅highearn log()(0.057) (.085) (.106) (.154)n = 1,524, R2 = .012.The estimate of δ1, .192, is remarkably close to the estimate obtained for Kentucky (.191). However, the standard error for the Michigan estimate is much higher (.154 compared with .069). The estimate for Michigan is not statistically significant at even the 10% level against δ1 > 0. Even though we have over 1,500 observations, we cannot get a very precise estimate. (For Kentucky, we have over 5,600 observations.)13.11 (i) Using pooled OLS we obtainrent= -.569 + .262 d90+ .041 log(pop) + .571 log(avginc) + .0050 pctstu log()(.535) (.035) (.023) (.053) (.0010) n = 128, R2 = .861.The positive and very significant coefficient on d90 simply means that, other things in the equation fixed, nominal rents grew by over 26% over the 10 year period. The coefficient on pctstu means that a one percentage point increase in pctstu increases rent by half a percent (.5%). The t statistic of five shows that, at least based on the usual analysis, pctstu is very statistically significant.(ii) The standard errors from part (i) are not valid, unless we thing a i does not really appear in the equation. If a i is in the error term, the errors across the two time periods for each city are positively correlated, and this invalidates the usual OLS standard errors and t statistics.(iii) The equation estimated in differences islog()∆= .386 + .072 ∆log(pop) + .310 log(avginc) + .0112 ∆pctsturent(.037) (.088) (.066) (.0041)n = 64, R2 = .322.Interestingly, the effect of pctstu is over twice as large as we estimated in the pooled OLS equation. Now, a one percentage point increase in pctstu is estimated to increase rental rates by about 1.1%. Not surprisingly, we obtain a much less precise estimate when we difference (although the OLS standard errors from part (i) are likely to be much too small because of the positive serial correlation in the errors within each city). While we have differenced away a i, there may be other unobservables that change over time and are correlated with ∆pctstu.(iv) The heteroskedasticity-robust standard error on ∆pctstu is about .0028, which is actually much smaller than the usual OLS standard error. This only makes pctstu even more significant (robust t statistic ≈ 4). Note that serial correlation is no longer an issue because we have no time component in the first-differenced equation.11311413.12 (i) You may use an econometrics software package that directly tests restrictions such as H 0: β1 = β2 after estimating the unrestricted model in (13.22). But, as we have seen many times, we can simply rewrite the equation to test this using any regression software. Write the differenced equation as∆log(crime ) = δ0 + β1∆clrprc -1 + β2∆clrprc -2 + ∆u .Following the hint, we define θ1 = β1 - β2, and then write β1 = θ1 + β2. Plugging this into the differenced equation and rearranging gives∆log(crime ) = δ0 + θ1∆clrprc -1 + β2(∆clrprc -1 + ∆clrprc -2) + ∆u .Estimating this equation by OLS gives 1ˆθ= .0091, se(1ˆθ) = .0085. The t statistic for H 0: β1 = β2 is .0091/.0085 ≈ 1.07, which is not statistically significant.(ii) With β1 = β2 the equation becomes (without the i subscript)∆log(crime ) = δ0 + β1(∆clrprc -1 + ∆clrprc -2) + ∆u= δ0 + δ1[(∆clrprc -1 + ∆clrprc -2)/2] + ∆u ,where δ1 = 2β1. But (∆clrprc -1 + ∆clrprc -2)/2 = ∆avgclr .(iii) The estimated equation islog()crime ∆ = .099 - .0167 ∆avgclr(.063) (.0051)n = 53, R 2 = .175, 2R = .159.Since we did not reject the hypothesis in part (i), we would be justified in using the simplermodel with avgclr . Based on adjusted R -squared, we have a slightly worse fit with the restriction imposed. But this is a minor consideration. Ideally, we could get more data to determine whether the fairly different unconstrained estimates of β1 and β2 in equation (13.22) reveal true differences in β1 and β2.13.13 (i) Pooling across semesters and using OLS givestrmgpa = -1.75 -.058 spring+ .00170 sat- .0087 hsperc(0.35) (.048) (.00015) (.0010)+ .350 female- .254 black- .023 white- .035 frstsem(.052) (.123) (.117) (.076)- .00034 tothrs + 1.048 crsgpa- .027 season(.00073) (0.104) (.049)n = 732, R2 = .478, 2R = .470.The coefficient on season implies that, other things fixed, an athlete’s term GPA is about .027 points lower when his/her sport is in season. On a four point scale, this a modest effect (although it accumulates over four years of athletic eligibility). However, the estimate is not statistically significant (t statistic ≈-.55).(ii) The quick answer is that if omitted ability is correlated with season then, as we know form Chapters 3 and 5, OLS is biased and inconsistent. The fact that we are pooling across two semesters does not change that basic point.If we think harder, the direction of the bias is not clear, and this is where pooling across semesters plays a role. First, suppose we used only the fall term, when football is in season. Then the error term and season would be negatively correlated, which produces a downward bias in the OLS estimator of βseason. Because βseason is hypothesized to be negative, an OLS regression using only the fall data produces a downward biased estimator. [When just the fall data are used, ˆβ = -.116 (se = .084), which is in the direction of more bias.] However, if we use just the seasonspring semester, the bias is in the opposite direction because ability and season would be positive correlated (more academically able athletes are in season in the spring). In fact, using just theβ = .00089 (se = .06480), which is practically and statistically equal spring semester gives ˆseasonto zero. When we pool the two semesters we cannot, with a much more detailed analysis, determine which bias will dominate.(iii) The variables sat, hsperc, female, black, and white all drop out because they do not vary by semester. The intercept in the first-differenced equation is the intercept for the spring. We have∆= -.237 + .019 ∆frstsem+ .012 ∆tothrs+ 1.136 ∆crsgpa- .065 seasontrmgpa(.206) (.069) (.014) (0.119) (.043) n = 366, R2 = .208, 2R = .199.Interestingly, the in-season effect is larger now: term GPA is estimated to be about .065 points lower in a semester that the sport is in-season. The t statistic is about –1.51, which gives a one-sided p-value of about .065.115(iv) One possibility is a measure of course load. If some fraction of student-athletes take a lighter load during the season (for those sports that have a true season), then term GPAs may tend to be higher, other things equal. This would bias the results away from finding an effect of season on term GPA.13.14 (i) The estimated equation using differences is∆= -2.56 - 1.29 ∆log(inexp) - .599 ∆log(chexp) + .156 ∆incshrvote(0.63) (1.38) (.711) (.064)n = 157, R2 = .244, 2R = .229.Only ∆incshr is statistically significant at the 5% level (t statistic ≈ 2.44, p-value ≈ .016). The other two independent variables have t statistics less than one in absolute value.(ii) The F statistic (with 2 and 153 df) is about 1.51 with p-value ≈ .224. Therefore,∆log(inexp) and ∆log(chexp) are jointly insignificant at even the 20% level.(iii) The simple regression equation is∆= -2.68 + .218 ∆incshrvote(0.63) (.032)n = 157, R2 = .229, 2R = .224.This equation implies t hat a 10 percentage point increase in the incumbent’s share of total spending increases the percent of the incumbent’s vote by about 2.2 percentage points.(iv) Using the 33 elections with repeat challengers we obtain∆= -2.25 + .092 ∆incshrvote(1.00) (.085)n = 33, R2 = .037, 2R = .006.The estimated effect is notably smaller and, not surprisingly, the standard error is much larger than in part (iii). While the direction of the effect is the same, it is not statistically significant (p-value ≈ .14 against a one-sided alternative).13.15 (i) When we add the changes of the nine log wage variables to equation (13.33) we obtain116117 log()crmrte ∆ = .020 - .111 d83 - .037 d84 - .0006 d85 + .031 d86 + .039 d87(.021) (.027) (.025) (.0241) (.025) (.025)- .323 ∆log(prbarr ) - .240 ∆log(prbconv ) - .169 ∆log(prbpris )(.030) (.018) (.026)- .016 ∆log(avgsen ) + .398 ∆log(polpc ) - .044 ∆log(wcon )(.022) (.027) (.030)+ .025 ∆log(wtuc ) - .029 ∆log(wtrd ) + .0091 ∆log(wfir )(0.14) (.031) (.0212)+ .022 ∆log(wser ) - .140 ∆log(wmfg ) - .017 ∆log(wfed )(.014) (.102) (.172)- .052 ∆log(wsta ) - .031 ∆log(wloc ) (.096) (.102) n = 540, R 2 = .445, 2R = .424.The coefficients on the criminal justice variables change very modestly, and the statistical significance of each variable is also essentially unaffected.(ii) Since some signs are positive and others are negative, they cannot all really have the expected sign. For example, why is the coefficient on the wage for transportation, utilities, and communications (wtuc ) positive and marginally significant (t statistic ≈ 1.79)? Higher manufacturing wages lead to lower crime, as we might expect, but, while the estimated coefficient is by far the largest in magnitude, it is not statistically different from zero (tstatistic ≈ –1.37). The F test for joint significance of the wage variables, with 9 and 529 df , yields F ≈ 1.25 and p -value ≈ .26.13.16 (i) The estimated equation using the 1987 to 1988 and 1988 to 1989 changes, where we include a year dummy for 1989 in addition to an overall intercept, isˆhrsemp ∆ = –.740 + 5.42 d89 + 32.60 ∆grant + 2.00 ∆grant -1 + .744 ∆log(employ ) (1.942) (2.65) (2.97) (5.55) (4.868)n = 251, R 2 = .476, 2R = .467.There are 124 firms with both years of data and three firms with only one year of data used, for a total of 127 firms; 30 firms in the sample have missing information in both years and are not used at all. If we had information for all 157 firms, we would have 314 total observations in estimating the equation.(ii) The coefficient on grant – more precisely, on ∆grant in the differenced equation – means that if a firm received a grant for the current year, it trained each worker an average of 32.6 hoursmore than it would have otherwise. This is a practically large effect, and the t statistic is very large.(iii) Since a grant last year was used to pay for training last year, it is perhaps not surprising that the grant does not carry over into more training this year. It would if inertia played a role in training workers.(iv) The coefficient on the employees variable is very small: a 10% increase in employ increases hours per employee by only .074. [Recall:∆≈ (.744/100)(%∆employ).] Thishrsempis very small, and the t statistic is also rather small.13.17. (i) Take changes as usual, holding the other variables fixed: ∆math4it = β1∆log(rexpp it) = (β1/100)⋅[ 100⋅∆log(rexpp it)] ≈ (β1/100)⋅( %∆rexpp it). So, if %∆rexpp it = 10, then ∆math4it= (β1/100)⋅(10) = β1/10.(ii) The equation, estimated by pooled OLS in first differences (except for the year dummies), is4∆ = 5.95 + .52 y94 + 6.81 y95- 5.23 y96- 8.49 y97 + 8.97 y98math(.52) (.73) (.78) (.73) (.72) (.72)- 3.45 ∆log(rexpp) + .635 ∆log(enroll) + .025 ∆lunch(2.76) (1.029) (.055)n = 3,300, R2 = .208.Taken literally, the spending coefficient implies that a 10% increase in real spending per pupil decreases the math4 pass rate by about 3.45/10 ≈ .35 percentage points.(iii) When we add the lagged spending change, and drop another year, we get4∆ = 6.16 + 5.70 y95- 6.80 y96- 8.99 y97 +8.45 y98math(.55) (.77) (.79) (.74) (.74)- 1.41 ∆log(rexpp) + 11.04 ∆log(rexpp-1) + 2.14 ∆log(enroll)(3.04) (2.79) (1.18)+ .073 ∆lunch(.061)n = 2,750, R2 = .238.The contemporaneous spending variable, while still having a negative coefficient, is not at all statistically significant. The coefficient on the lagged spending variable is very statistically significant, and implies that a 10% increase in spending last year increases the math4 pass rate118119 by about 1.1 percentage points. Given the timing of the tests, a lagged effect is not surprising. In Michigan, the fourth grade math test is given in January, and so if preparation for the test begins a full year in advance, spending when the students are in third grade would at least partly matter.(iv) The heteroskedasticity-robust standard error for log() ˆrexpp β∆is about 4.28, which reducesthe significance of ∆log(rexpp ) even further. The heteroskedasticity-robust standard error of 1log() ˆrexpp β-∆is about 4.38, which substantially lowers the t statistic. Still, ∆log(rexpp -1) is statistically significant at just over the 1% significance level against a two-sided alternative.(v) The fully robust standard error for log() ˆrexpp β∆is about 4.94, which even further reducesthe t statistic for ∆log(rexpp ). The fully robust standard error for 1log() ˆrexpp β-∆is about 5.13,which gives ∆log(rexpp -1) a t statistic of about 2.15. The two-sided p -value is about .032.(vi) We can use four years of data for this test. Doing a pooled OLS regression of ,1垐 on it i t r r -,using years 1995, 1996, 1997, and 1998 gives ˆρ= -.423 (se = .019), which is strong negative serial correlation.(vii) Th e fully robust “F ” test for ∆log(enroll ) and ∆lunch , reported by Stata 7.0, is .93. With 2 and 549 df , this translates into p -value = .40. So we would be justified in dropping these variables, but they are not doing any harm.。
PMP知识点整理 CH13 项目相关方管理
13.1 如何来识别相关方?
识别相关方是定期识别项目相关方,分析和记录他们的利益、参与度、相互依赖性、影 响力和对项目成功的潜在影响的过程。
识别相关方的目的是什么?
识别相关方的目别相关方的输入有哪些?
输入:项目章程、商业文件、项目管理计划、项目文件、协议、事业环境因素、组织过程 资产。
相关方识别的工具是什么?
工具:专家判断、数据收集、数据分析、数据表现、会议。
13.3 相关方参与度评估矩阵是用来做什么的? 包含哪些要素?
相关方参与度评估矩阵用于将相关方当前参与水平与期望参与水平进行比较。对相 关方参与水平进行分类的方式之一,如图 13-6 所示。相关方参与水平可分为如 下:
①不了解型。 ②抵制型。 ③中立型。 ④支持型。 ⑤领导型。 领导型的相关方是领导的,支持型的相关方是支持的。
13.4 如何管理相关方参与?
管理相关方参与是与相关方进行沟通和协作以满足其需求与期望、处理问题,并促进相关方 合理参与的过程。在管理相关方参与过程中,需要开展多项活动,例如:
①在适当的项目阶段引导相关方参与,以便获取、确认或维持他们对项目成功的持续承诺; ②通过谈判和沟通管理相关方期望; ③处理与相关方管理有关的任何风险或潜在关注点,预测相关方可能在未来引发的问题; ④澄清和解决已识别的问题。 管理相关方参与有助于确保相关方明确了解项目目的、目标、收益和风险,以及他们的贡献
将如何促进项目成功。
13.5 如何控制相关方参与,有什么作用?
控制相关方参与--更改为监督相关方参与。监督相关方参与是监督项目相关方关系,并 通过修订参与策略和计划来引导相关方合理参与项目的过程。本过程的主要作用是, 随着项目进展和环境变化,维持或提升相关方参与活动的效率和效果。
ch13简单国民收入决定
同理,有Δy =Δc+ Δs;
两边同除Δy,则 Δy/Δy = Δc/Δy
+Δs/Δy
即: MPC + MPS = 1 推断:若MPC递减,那么MPS
必递增。
c,s Poor A
c=c(y)
Rich
a
450
s=s(y)
-a
y0
y
消费曲线与储蓄曲线
储蓄与消费的互补——函数曲线
c,s
y=c+s
2.生命周期假说 美国 莫迪利安尼(Modigliani)
假说: (1)人在一生中,收入有规律地波动。 (2)家庭会通过金融资产市场,以理性方式统筹安排一生
的资源,实现一生中最平稳的消费路径。
结论: 人们偏好平稳消费,工作年份储蓄,退休年份动用储蓄。 如果中年人比例增大,消费倾向会下降。 反之会增加。
消费中受收入水平影响
a
的部分。
45º
c= a + by y
3.消费倾向 propensity
消费倾向:消费与收入的比率。
平均消费倾向 APC average propensity to consume 平均每单位收入中消费所占比例。 计算:总消费在总收入中所占比例=消费/收入=c/y
APC如果<1,消费总量<收入总量(产生储蓄); APC如果=1,把全部收入都用于消费(储蓄为零); APC如果>1,消费总量大于收入总量(负债消费,即产生负储蓄)。
收入 消费 储蓄 MPS APS
1 9000 9110 -110
-0.01
2 10000 10000 0 0.11 0
3 11000 10850 150 0.15 0.01
CH13 Direct Foreign Investment(国际金融管理,英文版)
Motives for DFI
Cost-Related Motives
Use foreign technology.
React to exchange rate movements, such as when the foreign currency appears to be undervalued. DFI can also help reduce the MNC’s exposure to exchange rate fluctuations.
Asian crisis, an MNC that had diversified among the Asian countries might have fared better than if it had focused on one country. Even better would be diversification among the continents.
Diversify sales/production internationally.
C13 - 7
Motives for DFI
• The optimal method for a firm to penetrate
a foreign market is partially dependent on the characteristics of the market.
C13 - 9
Change in Distribution of DFI
By U.S. Firms Over Time
DFI Distribution in 1982
Asia & Pacific 15% Middle East 2% Africa 3%
Ch13卡方分布应用
Goodness-of-Fit: An Example
# Vehicles 0 1 2 3+
[Oj– Ej ]2/ Ej 3.1296 0.0501 3.2910 0.3777 Sum = 6.8484 I. H0: p0 = 0.135, p1 = 0.337, p2 = 0.335, p3+ = 0.193 Vehicle-ownership distribution in this community is the same as it is in the nation as a whole. H1: At least one of the proportions does not equal the stated value. Vehicle-ownership distribution in this community is not the same as it is in the nation as a whole.
© 2002 The Wadsworth Group
Chi-Square Tests of Independence Between Two Variables
• The Question:
– Are the two variables independent? If the two variables of interest are independent, then
• Hypotheses: – H0: pi = values expected H1: pi values expected where p 1 . j © 2002 The Wadsworth Group
Goodness-of-Fit Tests
• Rejection Region:
CH13Types of Inventory(运营管理,英文版)
©2006 Pearson Prentice Hall — Introduction to Operations and Supply Chain Management — Bozarth & Handfield
Chapter 13, Slide 2
Chapter 13, Slide 9
What is the “Best” Order Size Q?
Determined by: • Inventory related costs
– Order preparation costs and setup costs – Inventory carrying costs – Shortage and customer service costs
Chapter 13, Slide 16
Sample Problems
• Pam runs a mail-order business for gym equipment. Annual demand for the TricoFlexers is 16,000. The annual holding cost per unit is $2.50 and the cost to place an order is $50. What is the economic order quantity?
Total Cost = Annual Holding Cost + Annual Ordering Cost
= [(Q/2) × H] + [(D/Q) × S] How do these costs vary as Q varies? Why isn’t item cost for the year included?
CH13-极限的运算ppt课件
.
8
x2
练习 计算 lim
.
x0 2 x2 4
解 采用分母有理化消去分母中趋向于零的因子.
原 式 lim x2(2 x24) x 0(2 x24)(2 x24)
x2(2 x2
lim x0
x2
4)
lim(2 x 0
x24)
4.
解题技巧:将分子或分母有理化,去掉“零因子”!
.
lim x3 lim 1
x2
lim( x2
x2
5x
3)
23 1
3
7. 3
x2
注: limP(x) P(a) (Q(a) 0).
x aQ(x) Q(a)
.
5
例3 求lxim 1x2x22x13. 商的法则不能用 解 x 1 时 ,分 子 ,分 母 的 极 限 都 是 零 .( 00 型 ) 先 约 去 分 子 和 分 母 的 公 因 子 ( x 1 ) 后 再 求 计 算 .
x x 0
u u 0
意义: 变量替换求极限的依据
令u g(x)
lim f [g(x)]
xx0
limg(x)
xx0
u0
lim f (u)
u u0
.
12
定理2(复合函数的极限运算法则-----变量代换法则)
设函数yf[g(x)]是由函数yf(u)与函数ug(x)复合而成
ulf i[mgu0(xf)(]u在) 点liAm x0的且f某[ 在g 去x(0x 心的)邻] 某 域去l内i心m 有邻f 定域(u 义内) g若(A xxl) i.m x0ug0(,x)则u0,
x0 xsinx x0 1sinx
13第三篇ch13信贷资产证券化
SPV自身风险的隔离
SPV的本质特性----破产隔离给予交易的安全 性以极大的保障
破产隔离,简言之,就是指实体一般不会遭受自 愿的或非自愿的破产
评级机构认为SPV是风险隔离的六点要求:
1.对SPV目标和能力的限制 2.对债务的限制 3.独立董事 4.不会合并或重组 5.独立契约 6.资产的担保权益
四.需要注意的问题
1.评级机构不对市场风险进行评判,因为市场 风险不是信用风险
2.评级机构也不会对投资者某项投资是否合适 发表任何见解
3.信用评级不表示某种证券的市场价格是否合 适
4.信用评级表明了对按照合同的期限偿还的 可能性的看法;信用评级既是非常精确的,也是 非常有限的
5.投资者的认可是评级机构成功的关键
信用评级概述
一.信用评级 信用评级是根据发行人.会计人员和其他
专业人士所提供的各种现在的信息和历史 纪录,依据对发行人的审查,以及在资产支撑 的证券中对发起人和基础应收款的服务商 的审查与对基础资产的分析的基础之上进 行的;当存在一种或多种形式的信用增级时, 评级也必须对信用增级的提供者进行分析
二.信用评级机构的作用
担保资产是一种权益资产,或者说是一种债权, 这种担保资产缺乏流动性,但是拥有稳定的, 可预期的未来现金流量
资产证券化具有信用提高功能,以达到证券市 场对这类证券的信用等级要求
资产证券化交易步骤
建立特设信托机构SPV 筛选可证券化的资产并组成资产池 原始权益人将资产“真实出售”给
3.资产证券化技术
证券化金融资产的特征
具有可预测的,稳定的未来现金流 在历史纪录中很少发生违约或损失事件 未来现金流比较均匀的分摊与资产的续存期内 所对应的债务人有广泛的地域分布和人口统计分布 原所有者持有该项资产已经有一段时间,在此期间
ch13 遗传病的诊断
胎儿镜
又称为羊膜腔镜或宫腔镜,是一种带有羊膜穿刺的 双套光导纤维内窥镜。可于怀孕15~21周进行操作。 主要用于胎儿血的取样、活检和产前诊断。也可对 胎儿形态异常进行直接观察,此外还可判定胎儿性 别和对某些遗传病进行宫内治疗。 该技术如果操作不当,会引起流产、母体免疫反应 等,所以应用受到一定的限制。
体外受精和 胚胎移植(in-vitro
fertilization embryo transfer, IVF-ET)
1978年世界第一例试管婴儿 诞生。 人类体外受精-胚胎移植方法 的建立。
胚胎移植前遗传病诊断 preimplantation genetic diagnosis, PGD
五、基因诊断
概念 基因诊断是利用DNA重组技术直接从 DNA水平检测类遗传性疾病的基因缺陷。 A、针对直接病因诊断; B、目的基因无组织和发育特异性
特 点
基因诊断方法
分子杂交 PCR及相关技术 DNA测序 基因芯片技术
分子杂交是根据碱基互补配对的原则,利用 标记探针鉴定DNA或RNA中特定基因顺序 的一种方法。 PCR技术是在体外快速扩增特异性DNA片断 地技术,使能够达到足够分析的纯度和量。
羊膜穿刺术
亦称羊水取样。抽取羊水最佳时间是妊娠16-18周, 因为此时羊水量多、胎儿浮动,穿刺时进针容易, 且不易伤及胎儿。 目前,羊膜腔穿刺术是胎儿产前诊断最常用、最 有效手段之一
羊膜穿刺术:
绒毛吸取术
可在B超监视下经宫颈部取样,一般于妊娠7-9周进 行。 绒毛枝经处理或经短期培养后进行染色体分析、酶 和蛋白质检测和基因分析。 优点是取样时间早,一旦作出明确诊断,需要进行 选择性流产时,不会给孕妇带来更多的损伤和问题。
CH13固有免疫细胞免疫应答
第十三章 固有免疫细胞的免疫应答 Innate Immunity
目录
1 组织屏障及其作用 2 固有免疫细胞 3 固有免疫效应分子及其主要作用 4 固有免疫应答
固有免疫(innate immunity)
特点
遗传性(genetic;早,出生时已具备, 可稳定性遗传给后代)
8
一、吞噬细胞(phagocyte)
吞噬细胞 phagocytes
单个核吞噬细胞(系统)
Mononuclear phagocyte system
中性粒细胞
neutrophils
单核细胞
巨噬细胞
monocyte
macrophage
小胶质细胞、库普弗细胞、破骨细胞
2020/8/4
9
(一)中性粒细胞----小吞噬细胞
➢树突状细胞:专职抗原提呈细胞。
➢NK细胞:ADCC作用(穿孔素、颗粒酶和FasL)。
➢γδT细胞:粘膜和皮肤组织,杀伤机制同CTL
➢NKT细胞:主要分布于骨髓、肝、胸腺,膜分子,杀伤机制同CTL。
➢B1细胞:发育较早,主要分布于胸腔、腹腔和肠壁的固有层,起抗早期感染和
维持自稳的作用。
2020/8/4
3. 微生物屏障 皮肤和粘膜表面的正常菌群。
2020/8/4
4
Secretions at epithelial surfaces
Site Source
Specific substances secreted
Eyes
Lacrimal glands (tears) Lysozyme, IgA and IgG
部位 皮肤 口腔 胃 肠道
Ch13英文课件 货币金融学 米什金 第七版
a financial institution has bought an asset, it is said to have taken a long position Short position(空头头寸) = if it has sold an asset that it has agreed to deliver to another party at a future date, it is said to have taken a short position
chapter 13
Financial Derivatives 衍生金融工具
Beginning in the 1970s and continuing into the 1980s and 1990s, interest rates and foreign exchange rates became more volatile, increasing the risk to financial institutions. To combat this, managers of financial institutions have demanded financial instruments to better manage risk.
远期(forwards)
Pros and Cons of forward contract
Pros : Flexible Cons: (1) Lack of liquidity: hard to find counterparty( 交易对手) (2) Subject to default risk: requires information to screen good from bad risk
ch13_Mass-Storage Structure 操作系统课件
12.11
C-SCAN (Cont.)
Applied Operating System Concepts
12.12
C-LOOK
Version of C-SCAN C-SCAN算法的一种形式。 Arm only goes as far as the last request in each direction, then reverses direction immediately, without first going all the way to the end of the disk. 磁臂在每个方向上仅仅移动到最远的请求 位置,然后立即反向移动,而不需要移动到磁盘的一端。
Requests for disk service can be influenced by the file-allocation method. 磁盘服务请求受到文件定位方式的影响。
The disk-scheduling algorithm should be written as a separate module of the operating system, allowing it to be replaced with a different algorithm if necessary. 磁盘调度算法应该写成操作系统中的一个独立模块, 在必要的时候允许用不同的算法来替换。
Chap 13:Mass-Storage Structure 海量存储结构
Applied Operating System Concepts 13.1
12.2
12.3
Disk Scheduling 磁盘调度
The operating system is responsible for using hardware efficiently — for the disk drives, this means having a fast access time and disk bandwidth. 操作 系统有责任高效地使用硬件——对于磁盘设备,这意味着很短的访问时间和磁盘带宽。
Ch13.色谱法导
总之,在液相色谱中,可采用如下方法提高柱效:
①.减小填料颗粒粒度;
②.用粘度低的溶剂作流动相;
③.采用低流速流动相;
④.减小填料孔穴深度;
⑤.适当提高柱温。
13.4 组分分离-基本分离方程式 塔板理论和速率理论都难以描述组份间的分离程度。 即柱效为多大时,相邻两组份能够被完全分离?相邻
⑵. 按分离机理分类
利用组分在吸附剂(固定相)上的吸附能力强弱
不同而得以分离的方法,称为吸附色谱法。利用组分
在固定液(固定相)中溶解度不同而达到分离的方法 称为分配色谱法。利用组分在离子交换剂(固定相)
上的亲和力大小不同而达到分离的方法,称为离子交
换色谱法。利用大小不同的分子在多孔固定相中的选
择渗透而达到分离的方法,称为凝胶色谱法或尺寸排
H A B u Cu
A项为涡流扩散项;B/ u项为分子扩散项;Cu为传质
项,;u为流动相平均线速度,单位为cm/s。
A─涡流扩散项:
A = 2λdp dp:固定相的平均颗粒直
径
λ:固定相的填充不均匀
因子
(动画)
固定相颗粒越小dp↘,填充的越均匀,A↘,H↘ ,柱效 N ↗。表现在涡流扩散所引起的色谱峰变宽现 象减轻,色谱峰较窄。 空心毛细管 A=0
1. 分离度 t R ( 2 ) t R (1) t R ( 2 ) t R (1) R 1 1.699 (W2 W1 ) (W1 / 2 ( 2 ) W1 / 2 (1) ) 2 2
在峰底宽度难于测量时使用
R=0.8:两峰的分离程度可达89%; R=1:分离程度98%; R=1.5:达99.7%(相邻两峰完全分离的标准)。
公司理财 Ch13 资本成本
P0
D1 RE g
RE
D1 P0
g
14-7
例:股利增长模型法
• 假定某公司预期下年股利为每股$1.50, 每年的股利增长率可以持续稳定在 5.1%水平。当前股票价格为$25,计算 该公司权益资本成本为多少?
1.50 RE 25 .051 .111 11.1%
14-8
例:估算股利增长率
• 估算增长率的方法之一,是利用历史 股利增长率的平均值
• 如果不考虑筹资费用,项目NPV将为 40,105 • 但将发行新证券将发生的筹资费用考虑近来以后,
NPV就变为负数了
14-37
快速测试
• 计算权益资本成本有哪两种方法? • 如何计算债务的资本成本,以及税后的债务
资本成本? • 计算WACC时所需要的资本结构权数可以如
何得到? • 什么是WACC? • 如果我们对所有项目都使用公司的WACC进
• RE = 6.1 + .58(8.6) = 11.1% • 可以发现,采用SML法与采用股利增
长模型法所估算出来的股利增长率比 较接近,因此应当可以肯定我们的估 算结果
14-12
SML法的优势与不足
• 优点
– 考虑了系统性风险的因素 – 适用于所有的公司,唯一的要求就是能计算出
该公司的贝塔系数
• 计算时,使用每类资本所提供的金额 大小作为权数
14-19
资本结构权数
• 符号约定
– E = 权益的市场价值 = 外发股数*每股价格 – D = 负债的市场价值 = 流通在外债券数*债券价格 – V = 公司的市场价值 = D + E
• 权重
– wE = E/V = 权益资本所占比例 – wD = D/V = 债务资本所占比例
Ch13交流-直流设备
第13章交流-直流设备(AC-DC Elements)单线图及地下电缆管道系统中的每一种设备类型均有其独立的编辑器。
除了设备的标识、母线联接以及状态之外,其它所有出现在各编辑器中的数据均视为工程电气属性数据。
单线图设备编辑器(One-line Diagram Element Editors)单线图工具条上的每一个设备均有其自己的定制编辑器。
本章讲述各个交流—直流设备的编辑器。
交流—直流设备(AC-DC Elements)后备电源变频器充电器逆变器13.1 后备电源(UPS(Uninterruptible Power Supply)可在该编辑器内输入与电力系统中的后备电源相关的各属性值。
后备电源由两个交流终端(输入与输出)和一个直流终端所组成。
直流终端位于其侧部,并且可被联接到一条直流母线(节点)。
后备电源的编辑器内包含有下列9个属性页:信息属性页额定值属性页负荷属性页短路阻抗属性页运行循环属性页谐波属性页可靠性属性页注释属性页评论属性页13.1.1 信息属性页(Info Page)在信息属性页中,指定后备电源的标识、所联接的母线的标识、投运/退出、设备馈线标签、名称和描述、数据类型、负荷优先级、配置状态、交流联接以及需求因子。
信息(Info)标识(ID)输入一个最多由25个包括文字和数字的字符组成的唯一的标识。
ETAP自动地为各后备电源分配一个唯一的标识。
这些分配的标识由默认标识加上一个整数组成,该整数从1开始随后备电源的数量增加而递增。
后备电源的默认标识可在菜单条中的默认菜单中更改,或者从工程视图中修改。
从…母线联接到…母线(In Bus and DC Bus)它们是后备电源的联接母线的标识。
如果其终端没有联接到任一条母线,那么该母线标识工程显示为空白。
为联接或重新联接一后备电流到一母线,请从该列表框中选择一母线。
在您点击OK 之后,单线图将被更新以显示新的联接。
注意:您可以将后备电源的终端和那些与该设备位于同一视图内的交流—直流母线,或者与位于其它视图内的母线进行联接(方法是联接复合网络的内部和外部引脚),您不能联接位于回收站内的母线。
ch13.简单国民收入决定理论
3.消费函数的线性表达式
C=α+βy α表示自发消费,不依存收 入变动而变动的消费,纵轴 截距;
c
C=α+βy
β表示MPC,直线斜率;
βy表示引致消费,依存收入 变动而变动。
α 0 y
MPC和APC的关系
消费函数为线性时, y C y APC MPC y y y 因此,APC MPC 随着收入的增加, 的值越来越小, y 所以,APC MPC
年轻时,c>y, s<0,负债;
青壮年期,c<y, s>0,s的用途有:还债,养老储蓄。 老年期,c>y, s<0,他有两件事要做:消费(用青年期的s), 讨债。
3.永久收入消费理论
提出者:米尔顿· 弗里德曼(美) 观点:暂时消费与暂时收入无关,而由永久收入决定。永久收入是指 消费者可以预计到的长期收入。 繁荣阶段,现实收入>永久收入,
第13章 简单国民收入决定理论
第一节 均衡产出
第二节 凯恩斯的消费理论 第三节 国民收入的基本模式 第四节 乘数理论
注 意
国民收入核算——解决GDP―是什么”、“是多少” 国民收入决定——解决GDP为什么会这样 “简单”——考察“两部门”、“产品市场”
第一节 均衡产出
一、简单国民收入决定理论的基本假设 两部门经济(居民户消费和储蓄,厂商生产和投资) 没有供给限制(存在资源闲置,物价不变,这是凯恩斯主 义的基本出发点) 折旧和公司未分配利润为零 投资为一常数:I=I0
400 300 200 100
200 200 200 200 200 200
4200 3900 3600 3300 3000 2700
Ch13矩形波导2
y
dl
z dz
x 0
图 13-8 衰减计算用图
四、TE10波衰减
在波导内表面壁dσ=dldz上衰减功率
dPL 1 2 J sm Rs dldz
2
式中,Jsm——表面电流密度;Rs——表面电阻。
dPL 1 2 c 1 2 J sm Rs dldz
2
1 2
Rs dz J sm dl
10模?
三、矩形波导中传输TE10模,试问图中哪些裂缝影 响波的传输? 已知
P 0 max Emax 480 ab Er 1 2a
2
PROBLEMS 13
1
2 3
4
5
若存在反射,试证:当驻波比为 时,功率容量
P P 0 max max ( 1) 4
不同温度时的饱和不汽密度
温度℃ 饱和不 汽密度 克/米3
0°
10°
20°
30°
40°
50°
4.84
9.4
17.3
30.3
51.2
83.0
二、TE10波的功率和容量
上面所讨论的认为系统传输行波,倘若传输驻波 则耐功率还会降低。如果令Pmax 是驻波比为ρ时的入 射功率,则
Pmax Pmax 0 ( 1) 4
(13-2)
很明显,
Ey Hx
1 2a
2
二、TE10波的功率和容量
根据电磁场理论
P
s
S d
2
s
1
* Re ( Et H t ) kdxdy
(13-3)
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Chapter 13一、选择题(本题包含100小题,每题?分,共?分)1.Alfred's income exceeds his expenditures. Alfred is aa. saver who demands money from the financial system.b. saver who supplies money to the financial system.c. borrower who demands money from the financial system.d. borrower who demands money from the financial system.2.If the government's expenditures exceeded its receipts, it would likelya. lend money to a bank or other financial intermediary.b. borrow money from a bank or other financial intermediary.c. directly buy bonds from the public.d. directly sell bonds to the public.3.Which of the following is correct?a. The maturity of a bond refers to the amount to be paid back.b. The principal of the bond refers to the person selling the bond.c. A bond buyer cannot sell a bond before it matures.d. None of the above are correct.4.The length of time until a bond matures is called thea. duration.b. term.c. maturity.d. intermediation.5.A perpetuity is distinguished from other bonds in that ita. pays continuously compounded interest.b. pays interest only when it matures.c. never matures.d. will be used to purchase another bond when it matures unless the owner specifies otherwise.6.Which of the following is correct?a. Some bonds have terms as short as a few months.b. Because they are so risky, junk bonds pay a low rate of interest.c. Corporations buy bonds to raise funds.d. All of the above are correct.7.Long-term bonds are generallya. less risky than short-term bonds and so pay higher interest.b. less risky than short-term bonds and so pay lower interest.c. more risky than short-term bonds and so pay higher interest.d. more risky than short-term bonds and so pay lower interest.8.Compared to long-term bonds, other things the same, short-term bonds generally havea. more risk and so pay higher interest.b. less risk and so pay lower interest.c. less risk and so pay higher interest.d. about the same risk and so pay about the same interest.9.On which bond is default most likely?a. a junk bondb. a municipal bondc. a U.S. government bondd. a corporate bond issued by Proctor and Gamble.10.Stephanie is interested only in the rate of interest and is willing to take a great deal of risk in exchange for a high return. She should look for bonds witha. tax exemptions and short terms.b. tax exemptions and long terms.c. no tax exemptions and short terms.d. no tax exemptions and long terms.11.Municipal bonds pay aa. low rate of interest because of their high-default risk and because the interest they pay is subject to federalincome tax.b. low rate of interest because of their low-default risk and because the interest they pay is not subject to federalincome tax.c. high rate of interest because of their high-default risk and because federal taxes must be paid on the interestthey pay.d. high rate of interest because of their low-default risk and because the interest they pay is not subject to federalincome tax.12.Which bond would you expect to pay the highest interest rate?a. a bond issued by the U.S. governmentb. a bond issued by General Motorsc. a bond issued by New York Stated. a bond issued by a new restaurant chain13.Jerry has the choice of two bonds, one that pays 3 percent interest and one that pays 6 percent interest. Which of the following is most likely?a. The 6 percent bond is less risky than the 3 percent bond.b. The 6 percent bond is a U.S. government bond, and the 3 percent bond is a junk bond.c. The 6 percent bond has a longer term than the 3 percent bond.d. The 6 percent bond is a municipal bond, and the 3 percent bond is a U.S. government bond.14.People who buy newly issued stock in a corporation such as Rockwood Pottery providea. debt finance and so become part owners of Rockwood.b. debt finance and so become creditors of Rockwood.c. equity finance and so become part owners of Rockwood.d. equity finance and so become creditors of Rockwood.15.If Huedepool Beer runs into financial difficulty, the stockholders asa. part owners of Huedepool are paid before bondholders get paid anything at all.b. part owners of Huedepool are paid after bondholders get paid.c. creditors of Huedepool are paid before bondholders get paid anything at all.d. creditors of Huedepool are paid after bondholders get paid.16.When opening a restaurant you may need to by ovens, freezers, tables, and cash registers. Economists call these expendituresa. capital investment.b. investment in human capital.c. business consumption expenditures.d. None of the above are correct.17.When a country saves a larger portion of its GDP, it will havea. less investment, and so have more capital and higher productivity.b. less investment, and so have less capital and higher productivity.c. more investment, and so have more capital and higher productivity.d. more investment, and so have less capital and higher productivity.18.People who buy stock in a corporation such as General Electric becomea. creditors of General Electric, so the benefits of holding the stock depend on General Electric's profits.b. creditors of General Electric, but the benefits of holding the stock do not depend on General Electric's profits.c. part owners of General Electric, so the benefits of holding the stock depend on General Electric's profits.d. part owners of General Electric, but the benefits of holding the stock do not depend on General Electric'sprofits.19.Which of the following people purchased the correct asset to meet their objective?a. Michelle wanted to be a part owner of Mamma Rosa's Pizza, so she purchased a bond issued by MammaRosa's Pizza.b. Tim wanted a high return, even if it meant taking some risk, so he purchased stock issued by Specific Electricinstead of bonds issued by Specific Electric.c. Jennifer wanted to buy equity in Honda, so she purchased bonds sold by Honda.d. All of the above are correct.20.The price of stock traded on exchanges are determined bya. the Corporate Stock Administration.b. NASDAQ.c. the supply and demand for the stock.d. All of the above are correct.21.Which of the following is not an important stock exchange in the United States?a. New York Stock Exchangeb. American Stock Exchangec. Chicago Mercantile Exchanged. NASDAQ22.All else equal, when people become more optimistic about a company's future, thea. supply of the stock and the price will both rise.b. supply of the stock and the price will both fall.c. demand for the stock and the price will both rise.d. demand for the stock and the price will both fall.23.World Wide Delivery Service Corporation develops a way to speed up their deliveries and reduce their costs. We would expect that this woulda. raise the demand for existing shares of the stock, causing its price to rise.b. decrease the demand for existing shares of the stock, causing its price to fall.c. raise the supply of the existing shares of stock, causing its price to rise.d. raise the supply of the existing shares of stock, causing its price to fall.24.Stock indexes area. the average of a group of stock prices.b. the average of a group of stock yields.c. reports in the newspaper that report on the price of the stock and earnings of the corporation.d. measures of the risk relative to the profitability of corporations.25.Volume, as reported in stock tables refers to thea. number of shares traded.b. percentage of shares outstanding traded.c. number of shares traded times the price they sold at.d. number of shares of a company traded divided by the shares of all companies traded.26.Profits not paid out to stockholders area. retained earnings.b. known as dividends.c. the denominator in the price-earnings ratio.d. All of the above are correct.27.Mount Adams Jazz Corporation has a price of $50, a dividend of $0.60, and retained earnings of $1.00 per share. The dividend yield on this stock isa. 3.2 percent.b. 2 percent.c. 1.2 percent.d. .8 percent.28.Queen City Sausage stock is selling at $40 per share, it has retained earnings of $2.00 per share and dividends of $.50 per share. What is the price-earnings ratio and what is the dividend yield?a. 20, 1.25 percentb. 20, 6.25 percentc. 16, 1.25 percentd. None of the above are correct.29.Buskins Corporation has issued 2 million shares of stocks. Their earnings were $10 million dollars of which they retained $6 million. What was the dividend per share?a. $2.b. $3.c. $5d. None of the above are correct.30.A high price-earnings ratio indicates that either the stock isa. undervalued or people have become more optimistic about the corporation's prospects.b. overvalued or people have become more optimistic about the corporation's prospects.c. overvalued or people have become less optimistic about the corporation's prospects.d. undervalued or people have become less optimistic about the corporation's prospects.31.PacknCamp Corporation has a price of $50, has issued 2,000,000 shares of stock, has retained earnings of $2 million dollars, and a dividend yield of 2 percent. The price-earnings ratio of PacknCamp isa. 50, which is high compared to historical standards of the market.b. 50, which is low compared to historical standards of the market.c. 25, which is low compared to historical standards of the market.d. 25, which is high compared to historical standards of the market.32.A low P/E for a stock indicates thata. people may expect earnings to fall in the future perhaps because the firm will be faced with increasedcompetition.b. its dividends have been low so that no one is willing to pay very much for it.c. the corporation is possibly overvalued.d. All of the above are correct.33.Use the following table to answer the following question.In dollar terms, which company paid the highest dividend per share?a. GenMillsb. Gillettec. Gracod. Hershey34.Financial intermediaries area. the same as financial markets.b. individuals who make a profits by buying a stock low and selling it high.c. a more general name for financial assets such as stocks, bonds, and checking accounts.d. financial institutions through which savers can indirectly provide funds to borrowers.35.Which of the following is correct?a. A large, well-known corporation like Proctor and Gamble typically uses financial intermediation to financeexpansion of its factories.b. On average, indexed funds outperform managed funds.c. Unlike corporate bonds and stocks, checking accounts are a store of value.d. Financial intermediaries are institutions through which savers can directly provide funds to borrowers.36.Which of the following is both a store of value and a common medium of exchange?a. corporate bondsb. mutual fundsc. checking account balancesd. All of the above are correct.37.As a money management fee, mutual funds usually charge their customersa. between 0.5 and 2.0 percent of assets each year.b. between 1.5 and 3.0 percent of assets each year.c. nothing, because they receive commissions from the firms whose stock they buy.d. a flat fee of about $50.38.It is claimed that a secondary advantage of mutual funds is thata. an investor can avoid investment charges and fees.b. they give ordinary people access to loanable funds for investing.c. they usually outperform stock market indexes.d. they give ordinary people access to the skills of professional money managers.39.A closed economy does nota. trade with other economies.b. have free markets.c. allow immigration.d. All of the above are correct.40.A closed economy does nota. trade with other economies.b. have free markets.c. allow immigration.d. All of the above are correct.41.Which of the following equations will always represent GDP in an open economy?a. S = I - Gb. I = Y - C + Gc. Y = C + I + Gd. Y = C + I + G + NX42.Which of the following equations most simply represents GDP in a closed economy?a. Y = C + I + G + NXb. S = I - Gc. I = Y - C + Gd. Y = C + I + G43.Which of the following equations represents national saving in a closed economy?a. Y - I - G - NXb. Y - C - Gc. Y - I - Cd. G + C - Y44.In a closed economy, national saving equalsa. investment.b. income minus the sum of consumption and government expenditures.c. private saving plus public saving.d. All of the above are correct.45.In a closed economy, what remains after paying for consumption and government purchases isa. national disposable income.b. national saving.c. public saving.d. private saving.46.Suppose that in a closed economy GDP is equal to 10,000, Taxes are equal to 1,500, Consumption equals 6,500, and Government expenditures equal 2,000. What is national saving?a. -500b. 0c. 1500d. None of the above are correct.47.Suppose that in a closed economy GDP is 10,000, consumption is 6,500, and taxes are 2,000. What value of Government expenditures would make national savings equal to 1000 and at that value would the government have a deficit or surplus?a. 2,500 deficitb. 2,500 surplusc. 1,000 deficitd. 1,000 surplus48.Suppose that consumption is 6,500, taxes are 1,500, and government expenditures are 2,000. If national savings are 1,000 and the economy is closed what is GDP?a. 9,500b. 10,000c. 10,500d. None of the above are correct.49.The country of Nemedia does not trade with any other country. Its GDP is $20 billion. Its government collects $4 billion in taxes and pays out $3 billion to households in the form of transfer payments. Consumption equals $15billion and investment equals $2 billion. What is public saving in Nemedia, and what is the value of the goods and services purchased by the government of Nemedia?a. -$2 billion and $3 billionb. $1 billion and $3 billionc. -$1 billion and $4 billiond. There is not enough information to answer the question.50.In a closed economy, private saving isa. the amount of income that households have left after paying for their taxes and consumption.b. the amount of income that businesses have left after paying for the factors of production.c. the amount of tax revenue that the government has left after paying for its spending.d. always equal to investment.51.Which of the following is not always correct in a closed economy?a. National saving equals private saving plus public saving.b. Net exports equal zero.c. Real GDP measures both income and expenditures.d. Private saving equals investment.52.If the tax revenue of the federal government exceeds spending, then the governmenta. runs a budget deficit.b. runs a budget surplus.c. runs a national debt.d. will increase taxes.53.A budget surplus is created ifa. the government sells more bonds than it buys back.b. the government spends more than it receives in tax revenue.c. private savings are greater than zero.d. None of the above are correct.54.Which of the following would a macroeconomist consider as investment?a. Ernest purchases a bond issued by Star-Kist.b. Jerry purchases stock issued by IBM.c. Alice builds a new restaurant.d. All of the above are correct.55.Fred is considering expanding his dress shop. If interest rates rise he isa. less likely to expand. This illustrates why the supply of loanable funds slopes downward.b. more likely to expand. This illustrates why the supply of loanable funds slopes upward.c. less likely to expand. This illustrates why the demand for loanable funds slopes downward.d. more likely to expand. This illustrates why the demand for loanable funds slopes upward.56.If the current market interest rate for loanable funds is above the equilibrium level, thena. the quantity of loanable funds demanded will exceed the quantity of loanable funds supplied and the interestrate will rise.b. the quantity of loanable funds supplied will exceed the quantity of loanable funds demanded and the interestrate will rise.c. the quantity of loanable funds demanded will exceed the quantity of loanable funds supplied and the interestrate will fall.d. the quantity of loanable funds supplied will exceed the quantity of loanable funds demanded and the interestrate will fall.57.The nominal interest rate is thea. interest rate corrected for inflation.b. interest rate as usually reported by banks.c. real rate of return to the lender.d. real cost of borrowing to the borrower.58.If the nominal interest rate is 5 percent and the rate of inflation is 2 percent, then the real interest rate isa. 7 percent.b. 3 percent.c. 2.5 percent.d. 2/5 percent.59.What would happen in the market for loanable funds if the government were to decrease the tax rate on interest income?a. The supply of and demand for loanable funds would shift right.b. The supply of and demand for loanable funds would shift left.c. The supply of loanable funds would shift right and the demand for loanable funds would shift left.d. None of the above are correct.60.Which of the following would not be a result of replacing the income tax with a consumption tax?a. The interest rate would decrease.b. Investment would decrease.c. The standard of living would eventually rise.d. The supply of loanable funds would shift right.61.In 1995 Congressperson Bill Archer proposed that the income tax be replaced with a consumption tax. If his program had been passed, then today it is likely that the equilibrium interest ratea. and quantity of loanable funds would be lower.b. and quantity of loanable funds would be higher.c. would be higher and the equilibrium quantity of loanable funds would be lower.d. would be lower and the equilibrium quantity of loanable funds would be higher.62.What would happen in the market for loanable funds if the government were to increase the tax on interest income?a. Interest rates would rise.b. Interest rates would be unaffected.c. Interest rates would fall.d. The change in the interest rate would be ambiguous.63.What would happen in the market for loanable funds if the government were to decrease the tax on interest income?a. There would be an increase in the amount of loanable funds borrowed.b. There would be a reduction in the amount of loanable funds borrowed.c. There would be no change in the amount of loanable funds borrowed.d. The change in loanable funds borrowed would be ambiguous.64.If Congress reduced the tax rate on interest income, investmenta. would increase and saving would decrease.b. would decrease and saving would increase.c. and saving would increase.d. and saving would decrease.65.Suppose a country has a consumption tax that is similar to a state sales tax. If its government eliminates the consumption tax and replaces it with an income tax that includes an income tax on interest from savings, what happens?a. There is no change in the interest rate or saving.b. The interest rate decreases and saving increases.c. The interest rate increases and saving decreases.d. None of the above are correct.66.Other things the same, countries that tax saving less will havea. lower interest rates and higher investment than other countries.b. lower interest rates and lower investment than other countries.c. higher interest rates and higher investment than other countries.d. higher interest rates and lower investment than other countries.67.Suppose that Congress were to repeal an investment tax credit. What would happen in the market for loanable funds?a. The demand and supply of loanable funds would shift right.b. The demand and supply of loanable funds would shift left.c. The supply of loanable funds would shift right.d. The demand for loanable funds would shift left.68.Suppose Congress institutes an investment tax credit. What would happen in the market for loanable funds?a. The interest rate and investment would fall.b. The interest rate and investment would rise.c. The interest rate would rise and investment would fall.d. None of the above is necessarily correct.69.An increase in the budget deficita. changes the supply of loanable funds.b. changes the demand for loanable funds.c. changes both the supply of and demand for loanable funds.d. does not influence the supply of or the demand for loanable funds.70.An increase in the budget deficit would cause aa. shortage of loanable funds at the original interest rate, which would lead to falling interest rates.b. surplus of loanable funds at the original interest rate, which would lead to rising interest rates.c. shortage of loanable funds at the original interest rate, which would lead to rising interest rates.d. surplus of loanable funds at the original interest rate, which would lead to falling interest rates.71.An increase in the budget deficita. makes investment spending fall.b. makes investment spending rise.c. does not affect investment spending.d. may increase, decrease, or not affect investment spending.72.Interest rates fall and investment falls. Which of the following could explain these changes?a. the government goes from a surplus to a deficitb. the government repeals an investment tax creditc. the government replaces a consumption tax with an income taxd. None of the above are correct.73.A change in the tax laws which increases the supply of loanable funds will have a bigger effect on investment whena. the demand for loanable funds is more elastic and the supply of loanable funds is more inelastic.b. the demand for loanable funds is more inelastic and the supply of loanable funds is more elastic.c. both the demand for and supply of loanable funds are more elastic.d. both the demand for and supply of loanable funds are more inelastic.74.Credit risk refers to a bond'sa. term to maturityb. probability of defaultc. tax treatmentd. price-earnings ratio75.National saving (or just saving) is equal toa. private saving + public savingb. investment + consumption expendituresc. GDP ─ government purchasesd. GDP ─ consumpti on expenditurese. None of the above76.If government spending exceeds tax collectionsa. there is a budget surplusb. there is a budget deficitc. private saving is positived. public saving is positivee. none of the above77.If GDP = $1000, consumption = $600, taxes = $100, and government purchases = $200, how much is saving and investment?a. saving = $200, investment = $200b. saving = $300, investment = $300c. saving = $100, investment = $200d. saving = $200, investment = $100e. saving = $0, investment = $078.Which of the following sets of government policies is the most growth oriented?a. lower taxes on the returns to saving, provide investment tax credits, and lower the deficitb. lower taxes on the returns to saving, provide investment tax credits, and increase the deficitc. increase taxes on the returns to saving, provide investment tax credits, and lower the deficitd. increase taxes on the returns to saving, provide investment tax credits, and increase the deficit 79.If the supply of loanable funds is very inelastic (steep), which policy would likely increase saving and investment the most?a. an investment tax creditb. a reduction in a budget deficitc. an increase in a budget deficitd. none of the above80.An increase in a budget surplus isa. a decrease in public savingb. an increase in public savingc. a decrease in private savingd. an increase in private savinge. none of the above81.The amount today that would be needed, at prevailing interest rates, to produce a particular sum in the future is known asa. compound valueb. future valuec. present valued. fair valuee. beginning value82.Using the rule of 70, if your income grows at 10 percent per year, your income will double in approximatelya. 700 yearsb. 70 yearsc. 10 yearsd. 7 yearse. There is not enough information to answer this question.83.Which of the following does not help reduce the risk that people face?a. buying insuranceb. diversifying their portfolioc. increasing the rate of return within their portfoliod. all of the above help reduce risk84.Diversification of a portfolio cana. reduce aggregate riskb. reduce idiosyncratic riskc. eliminate all risksd. increase the standard deviation of the portfolio's return85.The study of a company's accounting statements and future prospects to determine its value is known asa. diversificationb. risk managementc. information analysisd. fundamental analysis86.If the efficient markets hypothesis is true, thena. stocks tend to be overvaluedb. the stock market is informationally efficient so stock prices should follow a random walkc. fundamental analysis is a valuable tool for increasing one's stock returnsd. an index fund is a poor investment87.Which of the following should cause the price of a share of stock to rise?a. a reduction in aggregate riskb. an increase in expected dividendsc. all of the aboved. none of the above88.Speculative bubbles may occur in the stock marketa. when stocks are fairly valuedb. only when people are irrationalc. because rational people may buy an overvalued stock if they think they can sell it to someonefor even more at a later dated. during periods of extreme pessimism because so many stocks become undervalued89.The amount of unemployment that the economy normally experiences is known asa. efficiency wage unemploymentb. union unemploymentc. cyclical unemploymentd. the natural rate of unemployment90.The unemployment rate isa. 5.7%b. 6.0%c. 9.0%d. 9.9%e. Not enough information to answer91.The labour-force participation rate isa. 40.7%b. 44.8%c. 57.1%d. 62.7%e. None of the above92.An accountant with a CA designation that has been unable to find work for so long that she has stopped looking for work is considered to bea. employedb. unemployedc. not in the labour forced. not in the adult population93.Which of the following sources of unemployment is not based on the wage being held above the competitive equilibrium wage?a. unemployment due to job searchb. unemployment due to minimum-wage lawsc. unemployment due to unionsd. unemployment due to efficiency wages94.If, for any reason, the wage is held above the competitive equilibrium wagea. unions will likely strike and the wage will fall to equilibriumb. the quality of workers will fall due to the change in the number of workers in the applicantpoolc. the quality of labour supplied will exceed the quantity of labour demanded and there will bestructural unemploymentd. the quality of labour demanded will exceed the quantity of labour supplied and there will be alabour shortage95.Sectoral shifts tend to raise which type of unemployment?a. frictional unemploymentb. structural unemploymentc. cyclical unemploymentd. Sectoral shifts do not increase unemployment96.Union membership rates are lowest ina. Canada.b. The United States.c. Sweden.d. Denmark.97.Unions might increase efficiency in the case where theya. raise the wage for insiders above the competitive equilibriumb. offset the market power of a large firm in a company townc. lower the wage of local outsidersd. threaten a strike but don't actually follow through so there are no lost hours of work。