# 7 AGGREGATE SUPPLY AND AGGREGATE DEMAND* Chapter. Key Concepts

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1 Chapter 7 AGGREGATE SUPPLY AND AGGREGATE DEMAND* Key Concepts Aggregate Supply The aggregate production function shows that the quantity of real GDP (Y ) supplied depends on the quantity of labor (L ), the quantity of capital (K ), and the state of technology. When the wage rate makes the quantity of labor supplied equal the quantity of labor demanded, there is full employment. At full employment, the unemployment rate is the natural rate of unemployment, and the amount of GDP produced is potential GDP. Aggregate supply is the relationship between the quantity of real GDP supplied and the price level. Aggregate supply depends on the time frame. The macroeconomic long run is the period of time necessary for all changes to have occurred so that real GDP equals potential GDP. The long-run aggregate supply curve, LAS, is the relationship between the price level and real GDP when real GDP equals potential GDP. The LAS curve is vertical, as illustrated in Figure 7.1. Along the LAS curve, both the prices of goods and services and the prices of productive resources change. In contrast, the macroeconomic short run is a period during which some money prices are sticky and real GDP might be below, above, or at potential GDP and the unemployment rate might be above, below, or at the natural rate of unemployment. This is Chapter 23 in Economics. The short-run aggregate supply curve, SAS, is the relationship between the quantity of real GDP supplied and the price level in the short run when the money wage rate, the prices of other resources, and potential GDP remain constant. The SAS curve slopes upward, as illustrated in Figure 7.1. Along the SAS curve, only the price level changes; the money wage rate and other resource prices are constant. The SAS curve shifts leftward when the money wage rate (or other costs) rise. When the LAS curve shifts, so does the SAS curve. Three factors shift the LAS curve: Changes in the full-employment quantity of labor. Changes in the quantity of capital, including human capital. Advances in technology. 99

2 100 CHAPTER 7 (23) Short-run aggregate supply changes when the money wage rate or money price of other resources changes. A rise in the money wage rate decreases short-run aggregate supply and shifts the SAS curve leftward. It does not shift the LAS curve. The money wage rate changers when unemployment differs from the natural rate and when expected inflation changes. Aggregate Demand The quantity of real GDP demanded equals the sum of consumption expenditure (C ), investment (I ), government purchases (G ), and exports (X ) minus imports (M ). Aggregate demand shows the relationship between the quantity of real GDP demanded and the price level. As illustrated in Figure 7.2 the aggregate demand curve, AD, slopes downward. It does so for two reasons: Wealth effect A higher price level decreases the amount of real wealth (that is, the purchasing power of wealth), which decreases the quantity of real GDP demanded. Substitution effects An increase in the price level raises the interest rate, which reduces the quantity of real GDP demanded. In addition, an increase in the U.S. price level raises the price of U.S. goods relative to foreign goods. When aggregate demand increases, the AD curve shifts rightward. Three key factors shift the AD curve: Expectations higher expected future incomes, higher expected inflation, or higher expected profits increase current aggregate demand. Fiscal policy and monetary policy Fiscal policy is government attempts to influence the economy by changing taxes, transfer payments, and government purchases. An increase in government purchases increases aggregate demand. Reduced taxes and increased transfer payments raise disposable income (aggregate income minus taxes plus transfer payments) and thereby increase consumption expenditures and hence aggregate demand. Monetary policy is changes in interest rates and the quantity of money. Increasing the quantity of money or lowering interest rates increases aggregate demand. International factors a decline in the foreign exchange rate or an increase in foreign incomes increase net exports and hence aggregate demand. Macroeconomic Equilibrium Short-run macroeconomic equilibrium occurs when the quantity of GDP demanded equals the quantity supplied, which is where the AD and SAS curves intersect. In Figure 7.3 the equilibrium real GDP is \$10 trillion and the price level is 110. The price level adjusts to achieve equilibrium. Short-run equilibrium does not necessarily take place at full employment. Long-run macroeconomic equilibrium occurs when real GDP equals potential GDP so that the economy is on the LAS curve.

4 102 CHAPTER 7 (23) Questions True/False and Explain Aggregate Supply 11. At full employment, there is no unemployment. 12. Along the LAS curve, a rise in the price level and all resource prices increase the aggregate quantity of goods and services supplied. 13. Along the SAS curve, a rise in the price level increases the aggregate quantity of goods and services supplied. 14. Both the long-run and short-run aggregate supply curves shift rightward when the quantity of capital increases. 15. Any factor that shifts the short-run aggregate supply curve also shifts the long-run aggregate supply curve. Aggregate Demand 16. Aggregate demand equals consumption expenditure plus investment plus government purchases plus exports minus imports. 17. According to the wealth effect, the lower the quantity of real wealth, the larger will be the quantity of real GDP demanded. 18. The term monetary policy refers to the government s spending more money to purchase more goods and services. Macroeconomic Equilibrium 19. Long-run macroeconomic equilibrium occurs when real GDP equals potential GDP. 10. In the short run, an increase in expected future profits raises the price level and increases real GDP. 11. If the economy is in equilibrium at below full employment, there is a recessionary gap. 12. A rise in the money wage rate increases short-run aggregate supply, that is, shifts the short-run aggregate supply curve rightward. 13. If aggregate demand increases so the economy is producing more output than potential real GDP, then, with the passage of time, the money wage rate will rise in response to the higher price level. U.S. Economic Growth, Inflation, and Cycles 14. If the aggregate demand curve shifts rightward by more than the short-run aggregate supply curve shifts rightward, the price level rises. 15. If the aggregate demand curve and the short-run aggregate supply curve both shift rightward at the same time, real GDP increases. 16. The main forces generating persistent growth in real GDP are those that cause increases in long-run aggregate supply. Macroeconomic Schools of Thought 17. All macroeconomic schools of thought agree that the economy is self-regulating and would operate at full employment if left alone. Multiple Choice Aggregate Supply 11. Long-run aggregate supply is the level of real GDP at which a. aggregate demand always equals short-run aggregate supply. b. full employment occurs. c. more than full employment occurs. d. prices are sure to rise 12. Along which curve do money wages and the price level change in the same proportion? a. Both the SAS and the LAS curves. b. Only the SAS curve. c. Only the LAS curve. d. Neither the SAS curve nor the LAS curve. 13. Long-run aggregate supply will increase for all the following reasons EXCEPT a. reduced money wages. b. increased human capital. c. introduction of new technology. d. increased capital. 14. A technological improvement shifts a. both the SAS and LAS curves rightward. b. both the SAS and LAS curves leftward. c. the SAS curve rightward, but it leaves the LAS unchanged. d. the LAS curve rightward, but it leaves the SAS curve unchanged.

5 AGGREGATE SUPPLY AND AGGREGATE DEMAND An increase in the money wage rate shifts a. both the SAS and LAS curves rightward. b. both the SAS and LAS curves leftward. c. the SAS curve leftward, but leaves the LAS curve unchanged. d. the LAS curve rightward, but leaves the SAS curve unchanged. Aggregate Demand 16. The aggregate demand curve (AD) illustrates that, as the price level falls, a. the quantity of real GDP demanded increases. b. the quantity of real GDP demanded decreases. c. the AD curve shifts rightward. d. the AD curve shifts leftward. 17. As the price level rises, the quantity of real wealth and the aggregate quantity demanded. a. increases; increases b. increases; decreases c. decreases; increases d. decreases; decreases 18. Which of the following is classified as monetary policy? a. The government changing the amount of its purchases. b. The government changing its level of taxation. c. The government changing interest rates. d. The government financing a change in money wages. 19. Which of the following shifts the aggregate demand curve rightward? a. An increase in expected inflation. b. An increase in taxes. c. A fall in the price level. d. A rise in the price level. Macroeconomic Equilibrium 10. Short-run macroeconomic equilibrium occurs at the level of GDP where the a. economy is at full employment. b. AD curve intersects the SAS curve. c. SAS curve intersects the LAS curve. d. AD curve intersects the LAS curve. Use Table 7.1 for the next four questions. TABLE 7.1 Multiple Choice Questions 11, 12, 13, 14 Price level Aggregate demand (billions of 2000 dollars) Short-run aggregate supply (billions of 2000 dollars) Long-run aggregate supply (billions of 2000 dollars) 100 \$800 \$600 \$ In the short-run macroeconomic equilibrium, the price level is and the level of real GDP is billion. a. 100; \$600 b. 110; \$700 c. 120; \$600 d. 130; \$ In the short run, the economy is in a. a full-employment equilibrium and resource prices will not change. b. an above full-employment equilibrium and resource prices will rise. c. an above full-employment equilibrium and resource prices will fall. d. a below full-employment equilibrium and resource prices will fall. 13. In the short-run equilibrium, there is a. an inflationary gap of \$100 billion. b. an inflationary gap of \$50 billion. c. a recessionary gap of \$50 billion. d. a recessionary gap of \$100 billion. 14. Assuming no changes in aggregate demand or longrun aggregate supply, in the long-run macroeconomic equilibrium, the price level is and the level of real GDP is billion. a. 100; \$600 b. 110; \$700 c. 120; \$600 d. 130; \$600

6 104 CHAPTER 7 (23) 15. If real GDP is greater than potential real GDP, then the economy is a. not in macroeconomic equilibrium. b. in a full-employment equilibrium. c. in an above full-employment equilibrium. d. in a below full-employment equilibrium. 16. A below full-employment equilibrium can be the result of the a. AD curve shifting rightward. b. SAS curve shifting rightward. c. LAS curve shifting leftward. d. AD curve shifting leftward. Use Figure 7.4 for the next four questions. 19. When the economy in Figure 7.4 is moving to its long-run equilibrium, which curve shifts? a. The LAS curve shifts rightward. b. The LAS curve shifts leftward. c. The SAS curve shifts rightward. d. The SAS curve shifts leftward. 20. After the aggregate demand curve has shifted permanently to AD 1, the new long-run macroeconomic equilibrium will be at a. point a. b. point b. c. point c. d. No point identified with a letter in the figure. U.S. Economic Growth, Inflation, and Cycles 22. The fact that the short-run aggregate supply and aggregate demand curves do not shift at a fixed, steady pace explains a. persistent inflation. b. business cycles. c. trend growth in real GDP. d. large government budget deficits. 23. Persistent inflation is caused by a. persistent rightward shifts in the AD curve. b. persistent rightward shifts in the SAS curve. c. the tendency for long-run aggregate supply to increase faster than aggregate demand. d. persistent leftward shifts in the SAS and AD curves. Macroeconomic Schools of Thought 17. Which of the following factors might have shifted the aggregate demand curve rightward? a. Reduced taxes b. Less investment c. A decrease in government purchases d. Higher money wages 18. After the aggregate demand curve has shifted permanently to AD 1, the new short-run macroeconomic equilibrium is at point a. point a. b. point b. c. point c. d. No point identified with a letter in the figure. 23. Which school of thought says that expectations are the most important influence on aggregate demand? a. Keynesian school b. classical school c. monetarist school d. Both Keynesian and monetarist schools 24. Which school of thought believes the economy is self-regulating? a. Keynesian school b. classical school c. monetarist school d. Both classical and monetarist schools

7 AGGREGATE SUPPLY AND AGGREGATE DEMAND 105 Short Answer Problems 1. Why is the LAS curve vertical? 2. Why does the SAS curve have a positive slope? 3. The international substitution effect implies that an increase in the price level will lead to a decrease in the aggregate quantity of goods and services demanded. Explain why. 4. In Figure 7.5 illustrate an economy in long-run equilibrium, producing at the full-employment level of production. Indicate the equilibrium price level and level of real GDP. Also indicate the potential level of real GDP. 5. In Figure 7.6 illustrate an economy in short-run equilibrium producing at a below full-employment level of production. Indicate the equilibrium price level and level of real GDP and show the amount of the recessionary gap. 6. In Figure 7.7 illustrate an economy in short-run equilibrium producing at an above full-employment level of production. Indicate the equilibrium price level and level of real GDP and show the amount of the inflationary gap.

8 106 CHAPTER 7 (23) an above full-employment, a full-employment, or a below full-employment equilibrium. If either an inflationary or recessionary gap exists, calculate what it equals. d. As time passes, what happens to move the economy back to its long-run equilibrium? Illustrate this process in Figure 7.8 by drawing any other curves you need. Label the long-run equilibrium point c. What is the equilibrium level of GDP and price level in the long run? 18. Suppose that the AD curve shifts rightward. In the long run, how does this shift affect the SAS curve? Why does the SAS change only in the long run? TABLE 7.2 Short Answer Problem 7 Price level Aggregate demand (billions of 2000 dollars) Short-run aggregate supply (billions of 2000 dollars) Long-run aggregate supply (billions of 2000 dollars) 100 \$11 \$9 \$ Table 7.2 shows the initial aggregate demand, short-run, and long-run aggregate supply schedules for the nation of Macro. a. Draw the AD, SAS, and LAS curves for Macro in Figure 7.8. Label the equilibrium point a. What is the equilibrium level of real GDP and price level? b. Suppose that government purchases increase so that aggregate demand increases by \$2 billion at every price level. In Figure 7.8 draw the new aggregate demand curve. Label the new short run equilibrium point b. What is the equilibrium level of real GDP and price level in the short run? c. Why is point b not a long-run equilibrium? In your answer, mention the level of potential real GDP, and describe whether point b represents 19. Suppose that new, productivity enhancing technologies are discovered. In Figure 7.9 show how these technological advances affect the equilibrium level of real GDP and the price level. 10. Why are increases in the quantity of money the factor that created the persistent inflation that the United States has experienced for the last several decades? 11. Keynesian economists generally believe that government fiscal and monetary policy is desirable. Classical economists generally disagree. What accounts for this difference in views?

10 108 CHAPTER 7 (23) True/False Answers Aggregate Supply Answers 11. F Even at full employment, there is some unemployment, which is called the natural rate of unemployment. 12. F The LAS curve is vertical at the level of potential GDP. This fact indicates that the amount of potential GDP does not change when the price level and all resource prices rise. 13. T The SAS curve slopes upward, which means that an increase in the price level increases the quantity of real GDP supplied. 14. T An increase in the capital stock increases the nation s potential real GDP, thereby shifting both the LAS and SAS curves rightward. 15. F A change in money wages shifts the SAS curve, but does not shift the LAS curve. The LAS curve shifts only when potential GDP changes. Aggregate Demand 16. T Any factor that changes consumption expenditure, investment, government purchases, exports, or imports will have an affect on aggregate demand. 17. F The lower the quantity of real wealth, the smaller is the quantity of real GDP demanded, which is a reason for the negative slope of the aggregate demand curve. 18. F Monetary policy refers to changes in the quantity of money or interest rates. Macroeconomic Equilibrium 19. T At the long-run macroeconomic equilibrium, the economy is on its long-run aggregate supply curve. 10. T The increase in expected future profits shifts the AD curve rightward, thereby raising the price level and increasing real GDP. 11. T The recessionary gap is the amount by which actual GDP falls short of potential GDP. 12. F An increase in money wages causes short-run aggregate supply to decrease (not increase), which means the short-run aggregate supply curve shifts leftward (not rightward). 13. T If the economy is producing more than potential GDP, the amount of employment exceeds full employment. The tight labor market then puts upward pressure on money wages and money wages rise. U.S. Economic Growth, Inflation, and Cycles 14. T As long as the shift of the AD curve exceeds that of the SAS curve, the price level rises. But if the shift of the SAS curve exceeds that of the AD curve, the price level falls. 15. T Both shifts increase real GDP. 16. T As the nation s potential real GDP grows, the long-run aggregate supply curve shifts rightward. U.S. Economic Growth, Inflation, and Cycles 17. F The Keynesian school asserts that the economy is not self-regulating and would rarely operate at full employment if left alone. Multiple Choice Answers Aggregate Supply 1. b Long-run aggregate supply is at potential GDP, which occurs when the economy is at full employment. 2. c Moving along the LAS curve, both money wages and the price level change in the same proportion. (Moving along the SAS curve, only the price level changes.) 3. a Along the LAS curve, both the price level and money wage rate change, so a change in the money wage rate does not shift the LAS curve. 4. a Any factor that shifts the LAS curve, such as technological advances, also shifts the SAS curve. 5. c The change in money wages shifts the SAS curve but not the LAS curve. Aggregate Demand 6. a As the price level falls, a movement occurs along a stationary AD curve to a larger quantity of real GDP demanded. 7. d Real wealth equals the amount of wealth divided by the price level, so an increase in the price level decreases real wealth. In turn, this reduction decreases the quantity of real GDP demanded.

12 110 CHAPTER 7 (23) 4. Figure 7.10 shows the economy in a long-run, full employment equilibrium. The equilibrium price level is P, and the equilibrium level of real GDP is GDP pot. Potential real GDP also equals GDP pot. 6. Figure 7.12 shows the economy in a short-run, above full-employment equilibrium. The equilibrium price level is P and the level of real GDP is GDP. The inflationary gap is the difference between actual GDP and potential real GDP, which is GDP pot.the inflationary gap equals the length of the double-headed arrow in the figure. 5. Figure 7.11 shows the economy when it is in a below full-employment equilibrium. The price level is P, and the level of real GDP is GDP. The recessionary gap is the difference between potential real GDP, GDP pot, and the actual GDP, so it equals the length of the arrow in Figure a. Figure 7.13 shows the initial aggregate demand curve (AD 0 ) the initial short-run aggregate supply curve (SAS 0 ), and the long-run aggregate

13 AGGREGATE SUPPLY AND AGGREGATE DEMAND 111 supply curve (LAS ). Point a is the equilibrium point, where the aggregate demand curve crosses the short-run aggregate supply curve. This point also is a long-run equilibrium because it is on the LAS curve. The price level is 110 because this price level sets the aggregate quantity demanded equal to the aggregate quantity supplied. The level of real GDP is \$10 billion. b. As illustrated in Figure 7.13, the increase in government purchases shifts the aggregate demand curve from AD 0 to AD 1. The new, shortrun equilibrium point is labeled b. The price level rises to 120 and the level of real GDP increases to \$11 billion. c. Point b cannot be the long-run equilibrium because the economy is producing more than the potential level of real GDP. The long-run AS curve shows the potential level of real GDP to be \$10 billion. Hence the situation illustrated by point b in Figure 7.13 is an above full-employment equilibrium. The inflationary gap in Figure 7.13 equals \$1 billion, the difference between real GDP and potential real GDP. prices) rise. As money wages rise, the short-run aggregate supply curve shifts leftward. Figure 7.14 illustrates this process, whereby the shortrun aggregate supply curve has shifted from SAS 0 to SAS 1. When the short-run aggregate supply curve is SAS 1, the economy has reached its new long-run equilibrium at point c. At point c, the price level is 130 and the level of real GDP has returned to potential real GDP, \$10 billion. 18. A rightward shift of the AD curve raises the price level. In the short run, the money wage rate does not change, but in the long run the money wage rate will rise to reflect the higher price level. Hence, in the long run, the increase in money wages shifts the SAS curve leftward. The curve does not shift in the short run because money wages do not respond immediately to higher prices. Initially, prices rise but money wages are constant. But then, over time, workers demand higher money wage rates to make up for the fact that they must pay higher prices for the goods and services they purchase. Thus in the long run, money wages rise along with prices. d. As the answer in part (c) just described, the short-run equilibrium at point b is an above fullemployment equilibrium. Unemployment is below its natural rate. As a result of the tight conditions in the labor market (and other resource markets), money wages (and other resource 19. As Figure 7.15 shows, technological advances shift both the LAS and SAS curves rightward. However, the AD curve does not shift. As a result, the equilibrium price level falls from P 0 to P 1, and the level of real GDP increases, from GDP 0 to GDP The price level can rise as the result of either an increase in aggregate demand or a decrease in aggregate supply. However, the steady and persistent in-

15 AGGREGATE SUPPLY AND AGGREGATE DEMAND I m really glad that you re starting to catch on because I like having a friend in class. Now that you understand what happens at the start, it won t be hard to see the rest of the story. You re right that what we called point b in Figure 7.16 can t be the end of the story. So far the only thing that has happened is that the price level has fallen and we ve moved along SAS 0 to a lower level of real GDP. From the firms standpoint, the prices of the things they sell have fallen, but their costs haven t changed. As a result, their profits are being squeezed. This is why they cut production. But, as they were cutting back on output, they were firing and laying off workers. Point b is a below fullemployment equilibrium, with more unemployment than the natural rate. So workers start to accept lower wages and, in general, the prices of resources start to fall. Whenever we get to a below full-employment equilibrium, these sorts of adjustments occur. And as the prices of resources such as the money wage rate fall, firms find their profits starting to bounce back. As a result, they are willing to increase their supply of goods and services even if the price level doesn t change. For instance, even if the price level stays at 95, because their costs are falling, firms are willing to produce more than \$9 trillion of goods and services. To reflect this change, the SAS curve shifts rightward. As long as the money wage rate continues to fall, the SAS curve continues to shift rightward. Suppose that eventually the SAS curve has shifted from SAS 0 to SAS 1 in Figure In this case, just like in Figure 7.16, where we pretended to erase the AD 0 curve once it was no longer relevant, in Figure 7.17 we can now pretend to erase the SAS 0 curve because the fall in the money wage rate makes SAS 1 the relevant curve. So Figure 7.17 shows us that the new equilibrium will occur at point c, where SAS 1 intersects AD 1. The price level is 90 and real GDP is \$10 trillion. The new level of real GDP is on the LAS curve; that is, the new equilibrium level of GDP is equal to potential real GDP. This situation is a fullemploy-ment equilibrium so unemployment is back at its natural rate, eliminating downward pressure on money wages. So money wages stop falling, which means that the SAS curve stops shifting rightward. As a result, point c is the new long-run equilibrium point. Compared to the initial point a, at point c, once all the adjustments are completed, we see that the price level is lower (90 versus 100), but that real GDP is the same (both are \$10 trillion).

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