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Chapter 3 Income and Spending
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Aggregate demand and equilibrium output The accounting identity: Y=C+I+G+NX; All variables represent actual quantities. The aggregate demand: AD=C+I+G+NX; All variables represent desired quantities. What if they mismatch? AD>Y: unintended inventory reduction; AD<Y: unplanned additions to inventory.
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Aggregate demand and equilibrium output Unplanned additions to inventory: IU=Y-AD; IU>0: Firms respond by reducing output; IU<0: Firms respond by increasing output. Goods market equilibrium: Y=AD; Unintended changes to inventory is zero at equilibrium; Output is determined by aggregate demand.
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Aggregate demand and equilibrium output Equilibrium with constant aggregate demand.
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The consumption function and aggregate demand Assuming two-sector economy: Y=C+I; YD=Y. The Keynesian consumption function: c: marginal propensity to consume; Should use disposable personal income generally; All variables are in real terms.
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The consumption function and aggregate demand Empirical consumption function. DPI: Disposable Personal Income PCE: Personal Consumption Expenditures U.S., 1960.Q1 to 2001.Q3: Federal Reserve Economic Data
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The consumption function and aggregate demand Empirical consumption function. Regression line: PCE = - 71.23 + 0.93 DPI
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The consumption function and aggregate demand Consumption and saving: S=Y-C; The saving function: 1-c: marginal propensity to save. Planned investment and aggregate demand: Assume for now that planned investment is constant;
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The consumption function and aggregate demand Equilibrium income and output.
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The consumption function and aggregate demand Saving and investment:
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The multiplier The adjustment process: Initial increase in autonomous spending: Output increase: Secondary increase in induced spending: Output increase: Tertiary increase in induced spending: Output increase: Total increase in output:
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The multiplier The adjustment process.
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The government sector Assuming constant government expenditures and proportional tax: The consumption function: The aggregate demand:
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The government sector Equilibrium income: Income taxes as automatic stabilizers: The presence of income taxes lowers the multiplier; Fluctuations in output is usually caused by shifts in autonomous spending; A smaller multiplier reduces fluctuations in output.
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The government sector Effects of a change in government purchases.
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The government sector Effects of an income tax change
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The government sector Effects of increased transfer payments: An increase in transfer payments increases autonomous spending and output; The multiplier of transfer payments is smaller than that of government purchase.
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The budget The budget surplus depends on income: The effects of government purchases and tax changes on the budget surplus: An increase in government purchase reduces budget surplus; An increase in tax rate increases budget surplus.
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The full-employment budget surplus Budget surplus can be used to measure the nature of fiscal policy; Actual budget surplus hinges on actual income; Full employment surplus: Budget surplus at the full-employment level of income; The cyclical component of budget: BS*-BS Recession: surplus; Booms: deficit.
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