多恩布什宏观经济学第十版原版ppt

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Growth in GDP is caused by:
Increases in available resources (labor and capital) Increases in the productivity of those resources
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The Business Cycle and the Output Gap
[Insert Fig.1-1 here]
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The Long Run Model
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In the long run, the AS curve is vertical and pegged at the potential level of output
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[Insert Figure 1-2 here]
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Utilizes measures including total output, rates of unemployment and inflation, and exchange rates
Short run: movements in the business cycle Long run: economic growth
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Examines the economy in the short and long run
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Macroeconomics aggregates the individual markets vs. microeconomics examines the behavior of individual economic units and the determination of prices in individual markets
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In the short run, AD determines output, and thus unemployment
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The Medium Run
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How do we get from the horizontal short run AS curve to the vertical long run AS curve? The medium run AS curve is tilting upwards towards the long run AS curve position
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The Phillips Curve
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Prices tend to adjust slowly AD drives the economy in the meantime The speed of price adjustment is illustrated by the Phillips curve, which plots the inflation rate against the unemployment rate In the short run, AS curve is relatively flat, and movements in AD drive changes in prices, output, and unemployment
The given level of capital and technology determine the level of potential output Output is fixed, but prices determined by changes in AD
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Short Run Model: business cycle theories
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[Insert Figure 1-5 here]
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When AD pushes output above the sustainable level, firms increase prices As prices increase, the AS curve is no longer pegged at a particular price level
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Chapter 1
Introduction
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McGraw-Hill/Irwin Macroeconomics, 10e
© 2008 The McGraw-Hill Companies, Inc., All Rights Reserved. 1-2
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Deviation of output from the trend is referred to as the output gap
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Output gap = actual output – potential output Output gap measures the magnitude of cyclical deviations of output from the potential level
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Very Long Run Growth
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Figure 1-1a illustrates growth of income per person in the U.S. over last century growth of 2-3% per year Growth theory examines how the accumulation of inputs and improvements in technology lead to increased standards of living Rate of saving is a significant determinant of future well being and economic growth.
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For example, the US real GDP grew at an average rate of 3.4 percent per year from 1960 to 2005
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Growth rate is far from smooth (See Figure 1-1b)
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Conclusion: high rates of inflation are always due to changes in AD in the long run
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The Short Run Model
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Short run fluctuations in output are largely due to changes in AD
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[Insert Figure 1-4 here]
The AS curve is flat in the short run due to fixed/rigid prices, so changes in output are due to changes in AD
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Changes in AD in the short run constitute phases of the business cycle
What Is Macroeconomics?
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Macroeconomics is the study of the behavior of the economy as a whole and the policy measures that the government uses to influence it
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Business cycle is the pattern of expansion and contraction in economic activity about the path of trend growth
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[Insert Figure 1-7 here]
Trend path of GDP is the path GDP would take if factors of production were fully utilized
[Insert Figure 1-6 here]
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Growth and GDP
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The growth rate of the economy is the rate at which GDP is increasing
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Most developed economies grow at a rate of a few percentage points per year
Changes in AD determine how much of the productive capacity is used and the level of output and unemployment Prices are fixed in this period, but output is variable
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Output is determined by the supply side of the economy and its productive capacity The price level is determined by the level of demand relative to the productive capacity of the economy
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Macroeconomics In Three Models
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Study of macroeconomics is grounded in three models, each appropriate for a particular time period
Very Long Run Model: domain of growth theory focuses on growth of the production capacity of the economy Long Run Model: a snapshot of the very long run model, in which capital and technology are largely fixed