Macroeconomics CHAPTER 10. Aggregate Supply and Aggregate Demand. Aggregate Supply. The ShortRun Aggregate Supply Curve


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1 Aggregate Supply Macroeconomics CHAPTER 10 The aggregate supply curve shows the relationship aggregate output. Aggregate Supply and Aggregate Demand 3 What you will learn in this chapter: How the aggregate supply curve illustrates the relationship aggregate output supplied in the economy Why the aggregate supply curve in the short run is different from the aggregate supply curve in the long run How the aggregate demand curve illustrates the relationship aggregate output demanded in the economy How the AS AD model is used to analyze economic fluctuations How monetary policy and fiscal policy can stabilize the economy The ShortRun Aggregate Supply Curve The shortrun aggregate supply curve is upwardsloping because nominal wages are sticky in the short run:! a higher aggregate price level leads to higher profits and increased aggregate output in the short run. The nominal wage is the dollar amount of the wage paid. 2 4 The ShortRun Aggregate Supply Curve 5 7 Changes in!commodity prices,!nominal wages, and!productivity lead to changes in producers profits and shift the shortrun aggregate supply curve. 6 8
2 9 LongRun Aggregate Supply Curve The longrun aggregate supply curve shows the relationship aggregate output supplied that would exist if all prices, including nominal wages, were fully flexible. Actual and Potential Output 11 LongRun Aggregate Supply Curve Economic Growth Shifts the LRAS Curve Rightward From the Short Run to the Long Run Leftward Shift of the Shortrun Aggregate Supply Curve Aggregate Demand The aggregate demand curve shows the relationship between the aggregate price level and the quantity of aggregate output demanded by households, businesses, and the government From the Short Run to the Long Run Rightward Shift of the Shortrun Aggregate Supply Curve The Aggregate Demand Curve 14 16
3 17 Why Is the Aggregate Demand Curve Downward Sloping? Shifts of the Aggregate Demand Curve Rightward Shift It is downwardsloping for two reasons:!the first is the wealth effect of a change in the aggregate price level a higher aggregate price level reduces the purchasing power of households wealth and reduces consumer spending.!the second is the interest rate effect of a change in aggregate the price level a higher aggregate price level reduces the purchasing power of households money holdings, leading to a rise in interest rates and a fall in investment spending and consumer spending. 19 Shifts of the Aggregate Demand Curve Shifts of the Aggregate Demand Curve Leftward Shift The aggregate demand curve shifts because of!changes in expectations!wealth!the stock of physical capital Policy makers can use fiscal policy and monetary policy to shift the aggregate demand curve The Multiplier The Multiplier The size of the multiplier, 1/1! MPC, depends on the marginal propensity to consume, MPC: the larger the MPC, the larger the change in real GDP for any given autonomous increase in aggregate spending Total Increase in GDP from $50 Billion Rise in GDP The AS AD Model The ASAD model uses the aggregate supply curve and the aggregate demand curve together to analyze economic fluctuations
4 25 The AS AD Model Shifts of the SRAS Curve Stagflation is the combination of inflation and falling 27 aggregate output. ShortRun Macroeconomic Equilibrium Shifts of the SRAS Curve!The economy is in shortrun macroeconomic equilibrium when the quantity of aggregate output supplied is equal to the quantity demanded.!the shortrun equilibrium aggregate price level is the aggregate price level in the shortrun macroeconomic equilibrium.!shortrun equilibrium aggregate output is the quantity of aggregate output produced in the shortrun macroeconomic equilibrium Shifts of Aggregate Demand: ShortRun Effects LongRun Macroeconomic Equilibrium The economy is in longrun macroeconomic equilibrium when the point of shortrun macroeconomic equilibrium is on the longrun aggregate supply curve Shifts of Aggregate Demand: ShortRun Effects LongRun Macroeconomic Equilibrium 30 32
5 33 ShortRun Versus LongRun Effects of a Negative Selfcorrecting Mechanism In the long run the economy is self correcting: shocks to aggregate demand do not affect aggregate output in the long run. Recessionary gap 35 ShortRun Versus LongRun Effects of a Positive Demand Shock Negative Supply Shocks Inflationary gap Negative Supply Shocks Negative supply shocks pose a policy dilemma: a policy that stabilizes aggregate output by increasing aggregate demand will lead to inflation, but a policy that stabilizes prices by reducing aggregate demand will deepen the output slump. The End of Chapter 10 coming attraction: Chapter 11: Income and Expenditure Macroeconomic Policy The high cost in terms of unemployment of a recessionary gap and the future adverse consequences of an inflationary gap " Active stabilization policy, using fiscal or monetary policy to offset demand shocks:! Fiscal policy affects aggregate demand directly through government purchases and indirectly through changes in taxes or government transfers that affect consumer spending.! Monetary policy affects aggregate demand indirectly through changes in the interest rate that affect consumer and investment spending. 38
chapter: Aggregate Demand and Aggregate Supply Krugman/Wells 2009 Worth Publishers 1 of 58
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