1 / 39

Working With Our Basic Aggregate Demand/Supply Model

Chapter 10. Working With Our Basic Aggregate Demand/Supply Model. 1. Anticipated and Unanticipated Changes. Anticipated and Unanticipated Changes. Anticipated changes are foreseen by economic participants. Decision makers have time to adjust to them before they occur.

jbingham
Download Presentation

Working With Our Basic Aggregate Demand/Supply Model

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 10 Working With Our Basic Aggregate Demand/Supply Model

  2. 1. Anticipated and Unanticipated Changes

  3. Anticipated and Unanticipated Changes • Anticipated changes are foreseen by economic participants. • Decision makers have time to adjust to them before they occur. • Unanticipated changes catch people by surprise.

  4. 2. Factors that Shift Aggregate Demand

  5. Factors that Shift Aggregate Demand • An increase (decrease) in real wealth. • A decrease (increase) in the real rate of interest. • An increase in the optimism (pessimism) of businesses and consumers about future economic conditions. • An increase (decline) in the expected rate of inflation. • Higher (lower) real incomes abroad. • A reduction (increase) in the exchange rate value of the nation’s currency.

  6. Price level AD 1 Goods &Services(real GDP) AD 0 AD 2 Shifts in Aggregate Demand • An increase in real wealth, such as would result from a stock market boom, for example, will increase aggregate demand, shifting the entire curve to the right (from AD0 to AD1). • In contrast, a reduction in real wealth decreases the demand for goods & services, causing AD to shift to to the left (from AD0 to AD2).

  7. 1. Explain how and why each of the following factors would influence current aggregate demand in the United States: Questions for Thought: (a) An increased fear of recession. (b) An increased fear of inflation. (c) The rapid growth of real income in Canada and Western Europe. (d) A reduction in the real interest rate. (e) A higher price level (be careful).

  8. 3. Unanticipated Changes in Aggregate Demand

  9. Unanticipated Changes in Aggregate Demand • In the short-run, output will deviate from full employment capacity as prices in the goods & services market deviate from the price level that people expected. • Impact of unanticipated increases in AD: • Initially, the strong demand and higher price level in the goods & services market will temporarily improve profit margins. • Output will increase, the rate of unemployment will drop below the natural rate, and output will temporarily exceed the economy's long-run potential. • With time, however, contracts will be modified and resource prices will rise and return to their competitive relation with product prices. • Once this happens, output will recede to the economy's long-run potential.

  10. Price level LRAS SRAS1 Short-run effects of an unanticipated increase in AD P P 100 105 AD2 AD1 Goods &Services(real GDP) Y Y F 2 Unanticipated Increase in Aggregate Demand • In response to an unanticipated increase in AD for goods & services (shift from AD1 to AD2), prices will rise to P105 and output will temporarily exceed full-employment capacity (increases to Y2).

  11. LRAS SRAS2 Long-run effects of an unanticipated increase in AD P P P 110 100 105 Y Y Y 2 F F Unanticipated Increase in Aggregate Demand Price level SRAS1 AD2 AD1 Goods &Services(real GDP) • With the passage of time, prices in resource markets, including the labor market, will rise due to the strong demand. As a result, higher costs reduce aggregate supply to SRAS2. • In the long-run, a new equilibrium at a higher price level (P110) and an output consistent with the economy’s sustainable potential will occur. • Thus, the increase in demand will expand output only temporarily.

  12. Unanticipated Changes in Aggregate Demand • Impact of unanticipated reductions in AD: • Weak demand and lower prices in the goods & services market will reduce profit margins. Many firms will incur losses. • Firms will reduce output, the rate of unemployment will rise above the natural rate, and output will temporarily fall short of the economy's long-run potential. • With time, long-term contracts will be modified. • Eventually, lower resource prices and a lower real interest rate will direct the economy back to long-run equilibrium, but this may be a lengthy and painful process.

  13. Price level LRAS SRAS1 Short-run effects of an unanticipated reduction in AD P P 95 100 AD2 AD1 Goods &Services(real GDP) Y Y F 2 Unanticipated Reduction in Aggregate Demand • The short-run impact of an unanticipated reduction in AD (shift from AD1 to AD2) will be a decline in output (decreases to Y2), and a lower price level (P95). • Temporarily, profit margins decline, output falls, and unemployment rises below its natural rate.

  14. LRAS SRAS2 Long-run effects of an unanticipated reduction in AD P P P 95 90 100 AD2 Y Y Y F F 2 Unanticipated Reduction in Aggregate Demand Price level SRAS1 AD1 Goods &Services(real GDP) • In the long-run, weak demand and excess supply in the resource market will lead to lower wage rates and resource prices resulting in an expansion in short-run aggregate supply to SRAS2. • In the long-run, a new equilibrium at a lower price level (P90) and an output consistent with the economy’s sustainable potential will result. • This method of restoring equilibrium may be both long and painful.

  15. 4. Shifts in Aggregate Supply

  16. Shifts in Aggregate Supply • Factors that change LRAS: • An increase (decrease) in the supply of resources. • An improvement (deterioration) in technology and productivity. • Institutional changes that increase (reduce) the efficiency of resource use. • Factors that change SRAS: • A decrease (increase) in resource prices — that is, production costs. • A reduction (increase) in the expected rate of inflation. • Favorable (unfavorable) supply shocks, such as good (bad) weather or a reduction (increase) in the world price of a key imported resource.

  17. 1. Indicate how each of the following would influence U.S. aggregate supply in the short run: Questions for Thought: (a) An increase in real wage rates. (b) A severe freeze that destroys half the orange crop in Florida. (c) An increase in the expected rate of inflation in the future. (d) An increase in the world price of oil, a key import. (e) Abundant rainfall during the growing season of agricultural states.

  18. 5. Impact of Changes in Aggregate Supply

  19. Impact of Changes in Aggregate Supply • Economic growth and anticipated shifts in long-run aggregate supply. • Increases in LRAS will make it possible to produce and sustain a larger rate of output. • Both LRAS and SRAS will shift to the right and output will increase. • These changes generally take place slowly and therefore they need not disrupt long-run equilibrium.

  20. Price level Price level LRAS1 LRAS2 SRAS1 SRAS2 Y Y Goods &Services(real GDP) Goods &Services(real GDP) F,1 F,2 Shifts in Aggregate Supply • Such factors as an increase in the stock of capital or an improvement in technology will expand the economy’s potential output and shift the LRAS to the right (note that SRAS will also shift to the right). • Such factors as a reduction in resource prices, favorable weather, or a temporary decrease in the world price of an important imported resource would shift SRAS to the right (note that LRAS will remain constant).

  21. LRAS1 LRAS2 Price level SRAS1 SRAS2 P P 1 2 AD Goods &Services(real GDP) Y Y Y Y F2 F2 F1 F Growth in Aggregate Supply • Here we illustrate the impact of economic growth due to capital formation or a technological advancement, for example. • Both LRAS and SRASincrease (to LRAS2 and SRAS2); the full employment output of the economy expands from YF1 to YF2. • A sustainable, higher level of real output and real income is the result. If the money supply is held constant, a new long-run equilibrium will emerge at a larger output rate (YF2) and lower price level (P2).

  22. Impact of Changes in Aggregate Supply • The impact of changes in short-run aggregate supply (SRAS): • SRAS shifts to the right – output will temporarily exceed the economy's long-run potential. • Since the temporarily favorable supply conditions cannot be counted on in the future, the economy’s long-term production capacity will not be altered. • Recognizing that they will be unable to maintain their current high level of income, individuals will generally save a substantial portion of it for use at a future time that is not nearly so prosperous. • The increased saving will reduce interest rates, which encourages investment (capital formation).

  23. Price level SRAS1 LRAS SRAS2 P P 2 1 AD Goods &Services(real GDP) Y Y Y 2 F F Unanticipated, Temporary Increase in Aggregate Supply • Here we illustrate an unanticipated, but temporary, increase in aggregate supply, such as may result from a bumper crop caused by good weather. • The increase in aggregate supply (shift to SRAS2) would lead to a lower price level (P95) and an increase in current GDP to Y2. • Since the favorable supply conditions cannot be counted on in the future, the economy’s long-run aggregate supply will not increase.

  24. Real InterestRate S1 S2 r r 1 2 D Quantity of Loanable Funds Q Q 1 2 Growth in Aggregate Supply Loanable FundsMarket • Predictably, decision makers will save a large proportion of their temporary higher real income, spreading the benefits into the future. • Thus, the supply of loanable funds will increase (from S1 to S2). • The real interest rate will fall to r2, encouraging expenditures on interest-sensitive capital goods and consumer durables.

  25. Impact of Changes in Aggregate Supply • The impact of unanticipated reductions in short-run aggregate supply (SRAS): • If an unfavorable supply shock is expected to be temporary, long-run aggregate supply will be unaffected. • Households will reduce their current saving level (and dip into past savings) to maintain a current consumption level more consistent with their longer-term perceived opportunities. • The reduction in saving will lead to higher real interest rates and retard current investment.

  26. PriceLevel S2 S1 P r2 P r1 D Quantity of Resources Q Q 1 2 Reduction in Resources: A Supply Shock ResourceMarket • Suppose there is an unanticipated reduction in the supply of resources, perhaps as the result of a crop failure or a sharp increase in the world price of a major imported resource, such as oil. • Resource prices would rise from P1 to P2.

  27. Price level LRAS SRAS2 (Pr2) SRAS1 (Pr1) B A P P 100 110 AD Goods &Services(real GDP) Y Y F 2 Effects of Adverse Supply Shock • The higher resource prices shift the SRAS curve to the left; in the short-run, the price level rises to P110 and output falls to Y2. • What happens in the long-run depends on whether the reduction in the supply of resources is temporary or permanent. • If temporary, resource prices fall in the future, permitting the economy to return to its original equilibrium (A). • If permanent, the productive potential of the economy will shrink (LRAS shifts to the left) and (B) will become the long-run equilibrium.

  28. 6. The Business Cycle-- Revisited

  29. The Business Cycle-- Revisited • Recessions occur because prices in the goods & services market are low relative to the costs of production and resource prices. • The two causes of recessions: • unanticipated reductions in aggregate demand, and, • unfavorable supply shocks. • An unsustainable economic boom occurs when prices in the goods & services market are high relative to costs and resource prices. • The two causes of booms are: • unanticipated increases in aggregate demand, and, • favorable supply shocks.

  30. Expansion Expansion Real GDP(billions of 1987 $) 6,000 1990 Recession 4,000 RealGDP 1982 Recession 1980 Recession 1974–75 2,000 Recession 1970 Recession 1960 Recession 0 1960 1965 1970 1975 1980 1985 1990 1995 2000 Actual rate of unemployment Percentage of the Labor Force Unemployed Natural rate of unemployment(estimated range) 10 8 6 4 2 0 2000 1960 1965 1970 1975 1980 1985 1990 1995 Source: Derived from computerized data supplied by FAME Economics. Expansions, Recessions, and the Rate of Unemployment • Here we illustrate the periods of expansion and contraction (recession) since 1960. • Note how the reductions in real GDP (shaded periods) in the top graph are associated with increases in the rate of unemployment well above the natural rate (bottom graph). • The AD/AS model indicates that recessions are caused by unanticipated reductions in AD that are likely to accompany abrupt reductions in the inflation rate and/or adverse supply shocks that might occur, for example, when there is a large increase in the price of a key imported resource, such as crude oil.

  31. 7. Does the Market Have a Self-Corrective Mechanism That Will Keep it on Track?

  32. Does the Market Have a Self-Corrective Mechanism That Will Keep it on Track? • There are three reasons to believe that it does: • Consumption demand is relatively stable over the business cycle. • Changes in real interest rates will help to stabilize aggregate demand and redirect economic fluctuations. • Interest rates will tend to fall during a recession and rise during and economic boom. • Changes in real resource prices will redirect economic fluctuations. • Real resource price will tend to fall during a recession and rise during an economic expansion.

  33. LRAS Price level P P r r Goods &Services(real GDP) Unemployment greaterthan Natural Rate Unemployment lessthan Natural Rate Y F Changes in Real Interest Rates and Resource Prices Over the Business Cycle Real interest rates rise (because of strongdemand for investment) Real interest rates fall (because of weak demand for investment) r r Real resource prices fall (because of weak demand and high unemployment) Real resource prices rise (because of strong demand and low unemployment) • When aggregate output is less than the economy’s full employment potential (YF), weak demand for investment leads to lower real interest rates, while slack employment in resource markets will place downward pressure on wages and other resource prices (Pr). • Conversely, when output exceeds YF, strong demand for capital goods and tight labor market conditions will result in rising real interest rates and resource prices (Pr).

  34. Price level LRAS SRAS2 SRAS1 Higher resource prices reduceSRAS Higher real interest rates reduceAD P P P 105 95 100 In the short-run, outputmay exceed or fall short of the economy’s full-employment capacity (YF). AD1 AD2 Goods &Services(real GDP) Y Y Y Y F 1 F F The Economy’s Self Corrective Mechanism • If output is temporarily greater than the economy’s potential, higher real interest rates and resource prices will lead to a lower but sustainable rate of output. • Higher interest rates will reduce AD (from AD1 to AD2). • At the same time, higher resource prices will increase production costs and therefore reduce SRAS (from SRAS1 to SRAS2). • These forces direct output toward full-employment potential (YF).

  35. Price level LRAS SRAS1 SRAS2 Lower resource prices increaseSRAS Lower real interest rates increaseAD P P P 100 95 105 In the short-run, outputmay exceed or fall short of the economy’s full-employment capacity (YF). Goods &Services(real GDP) AD1 AD2 Y Y Y Y F 1 F F The Economy’s Self Corrective Mechanism • If output is temporarily less than capacity, lower interest rates (reflecting the weak demand for investment funds) will stimulate aggregate demand (shifting AD from AD1 to AD2). • In addition, lower resource prices will reduce production prices (because of weak demand and abnormally high unemployment) and thereby stimulate SRAS (shifting SRAS to SRAS2). • This output will move the economy toward full-employment capacity. However, this self-correction process may take some time.

  36. 8. The Great Debate:-- How rapidly does the self-corrective mechanism work?

  37. The Great Debate:-- How rapidly does the self-corrective mechanism work? • Many economists believe that the self-corrective mechanism works slowly. • If this is the case, then market economies will still experience prolonged periods of abnormally high unemployment and below-capacity output. • Others believe that the self-corrective mechanism works fairly rapidly if it is not disrupted by perverse monetary and fiscal policy. • This is an important and continuing debate that we will return to and analyze in more detail as we proceed.

  38. 1. Suppose consumers and investors suddenly become more pessimistic about the future and therefore decide to reduce their consumption and investment spending. How will a market economy adjust to this increase in pessimism? What will happen to the real rate of interest? Questions for Thought: 2. Suppose that an unexpectedly rapid growth in real income abroad leads to a sharp increase in the demand for U.S. exports. What impact will this change have on the price level, output, and employment in the short run? In the long run? 3. When current output is less than full employment capacity, explain how the self-corrective mechanism will direct output toward the economy’s long-run potential. Can you think of any reason why this mechanism might not work? Discuss.

  39. EndChapter 10

More Related