# 3 Macroeconomics LESSON 5

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1 3 Macroeconomics LESSON 5 Short-Run Equilibrium Introduction and Description In this lesson, the focus is on the short-run equilibrium between aggregate supply and demand, on the changes in output and price level if aggregate supply or aggregate demand changes, and on the students ability to explain correctly why the curve shifted in a specific direction. The relationship between the simple nesian model and the aggregate supply-aggregate demand model is explored. Activity 25 provides the students with practice at manipulating the aggregate demand and aggregate supply model and interpreting the effects on the price level and real GDP. Students who perform well on this activity have an excellent foundation for the rest of the course. Activity 26 relates the nesian simple model and the and AS model. Objectives 1. Explain the macroeconomic equilibrium. 2. Explain what happens to the equilibrium price level and quantity with a change in aggregate demand. 3. Explain what happens to the equilibrium price level and quantity with a change in aggregate supply. 4. Explain what happens to the equilibrium price level and quantity with a change in aggregate demand and aggregate supply. 5. Explain the relationship between the simple nesian model and the and AS model. 6. Distinguish among equilibrium below, above and at full employment. Time Required Two class periods or 90 minutes Materials 1. Activities 25 and Visuals 3.11 and 3.12 Procedure 1. Project Visual 3.11 and focus on the top graph. Short-run macroeconomic equilibrium occurs when real GDP demanded equals real GDP supplied. This is Point A in the graph, or the level of output Y. If the price level (P 1 ) is above the equilibrium, then the aggregate supply (Y 2 ) is greater than the aggregate demand (Y 1 ). Firms experience an accumulation of inventory; they cut production and employment; output decreases toward the equilibrium level. Have the students tell a comparable story if the price level is below equilibrium. 2. Explain that the long-run macroeconomic equilibrium occurs at point B in the lower graph of Visual Use Visual 3.12 to examine what happens if there is an increase in aggregate demand. The new equilibrium is at a higher price level and a higher level of output. In response to the increase in demand, firms increase production and price. Go through decreases in aggregate demand, decreases in aggregate supply and increases in aggregate supply and have the students explain what happens in the economy. 4. Have the students complete Activity 25. Review the answers with the students. 5. Review the simple nesian model. Remember that in the simple nesian model, the price level is held constant. Show the relationship among changes in components of aggregate expenditures, aggregate demand and the effects on equilibrium real GDP. 6. Have the students complete Activity 26. Review the answers with the students. Advanced Placement Economics Teacher Resource Manual National Council on Economic Education, New York, N.Y. 479

2 Short-Run Equilibrium Price Level and Output Part A Equilibrium Figure 25.1 Equilibrium Price and Output Levels P 2 P P 1 Y 1. What are the equilibrium price level and output? P and Y 2. What would eventually happen to the price level and output if the initial price level were P 2 rather than P? Why would this happen? There is excess supply of goods and services. Inventories are building up. To reduce the inventory levels, firms will cut prices and output. The price level will fall, and real output will decrease. This would happen because higher inventories will cause sellers to reduce prices; lower prices will provide fewer incentives to increase production. However, consumers will purchase more output at lower prices. 3. What would eventually happen to the price level and output if the initial price level were P 1 rather than P? Why would this happen? There is excess demand. Inventories are below intended levels. Firms will seek to increase inventory levels, prices will rise and output will increase. This would happen because competition among buyers will increase the price level; increased prices will encourage producers to increase their output and consumers will buy less. 480 Advanced Placement Economics Teacher Resource Manual National Council on Economic Education, New York, N.Y.

3 Part B Changes in the Equilibrium Price Level and Output For each situation described below, illustrate the change on the and AS graph and describe the effect on the equilibrium price level and real GDP by circling the correct symbol: for increase, for decrease, or for unchanged. 4. Congress passes a tax cut for the middle 5. During a recession, the government class, and the president signs it. increases spending on schools, highways and other public works. Middle Class Tax Cut Increased Government Spending 1 1 Price level: Price level: Real GDP: Real GDP: 6. New oil discoveries cause large decreases 7. Illustrate the effects of an increase in aggregate in energy prices. demand. New Oil Discoveries Effects of an Increase in 1 1 Price level Price level Real GDP Real GDP Advanced Placement Economics Teacher Resource Manual National Council on Economic Education, New York, N.Y. 481

4 8. Illustrate the effects of increases in 9. New technology and better production costs. education increase productivity. Effects of Increases in Production Costs 1 Effects of New Technology and Better Education 1 Price level Price level Real GDP Real GDP 10. A new president makes consumers and 11. With the unemployment rate at five businesses more confident about the percent, the federal government future economy. Note: Show the reduces personal taxes and increases change in only. spending. Note: Show the change in only. Increased Confidence for Future Economy Reduced Taxes and Increased Government Spending 1 LRAS 1 Price level Price level Real GDP Real GDP 482 Advanced Placement Economics Teacher Resource Manual National Council on Economic Education, New York, N.Y.

5 Part C Summarizing Aggregate Demand and Aggregate Supply Shifts For each of the events below, make additions to the graph to illustrate the change. Then indicate the response in terms of shifts in or movements along the aggregate demand or aggregate supply curve and the short-run effect on real GDP and the price level. Indicate shifts in the curve by S and movements along the curve by A. Indicate the changes in price level, unemployment and real GDP with an up arrow for an increase and a down arrow for a decrease. 1. Increase in labor productivity due to technological change 2. Increase in the price of inputs used by many firms 3. Boom in investment assuming some unemployed resources are available 4. A major reduction in investment spending Curve AS Curve A A S S S S A A Real GDP Price Level Unemployment Advanced Placement Economics Teacher Resource Manual National Council on Economic Education, New York, N.Y. 483

6 3 Macroeconomics LESSON 5 ACTIVITY 26 Answer Reconciling the nesian Aggregate Expenditure Model With the Aggregate Demand and Aggregate Supply Model Now it is time to reconcile the nesian aggregate expenditure model with the aggregate demand and supply model. We find both differences and similarities when comparing the two models: The nesian model is a fixed, or constant, price model while the and AS model is a variableprice model. The vertical axis of the nesian model is aggregate expenditure while the vertical axis of the and AS model is price level. Aggregate expenditure (C + I + G + Net Exports) on the nesian model is aggregate demand on the and AS model. A shift upward in aggregate expenditure is the same as a shift outward in aggregate demand. A shift downward of aggregate expenditure is the same as a shift inward of aggregate demand. The s and AS model can account for shifts in aggregate supply. The nesian model cannot do so. In the nesian model, a shift in aggregate expenditures results in the full multiplier effect, and the multiplier can easily be calculated from the graphs. In the and AS model, the multiplier is not at full strength on the positively sloped and vertical AS curves. In the and AS model, the increase in the price level diminishes the impact of the multiplier. 484 Advanced Placement Economics Teacher Resource Manual National Council on Economic Education, New York, N.Y.

7 3 Macroeconomics LESSON 5 ACTIVITY 26 Answer For each of the following situations, illustrate the indicated change on both the and AS model and the nesian model. 1. The economy is at less than full employment. An increase in consumer confidence moves the economy to full employment. Figure 26.1 An Increase in Consumer Confidence Less Than Full Employment Using the and AS Model Less Than Full Employment Using the nesian Model AE 1 LRAS 1 AGGREGATE EXPENDITURES 45 FE AE 2. The economy is at full employment but businesses begin to believe that a recession is ahead. Figure 26.2 Businesses Believe a Recession Is Coming Full Employment Using the and AS Model Full Employment Using the nesian Model LRAS 1 AGGREGATE EXPENDITURES AE AE 1 45 FE Advanced Placement Economics Teacher Resource Manual National Council on Economic Education, New York, N.Y. 485

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