# Chapter 21

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## Chapter 21

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1. Chapter 21 Output, Inflation and Monetary Policy

2. Output, Inflation, & Monetary Policy: The Big Questions • Why do inflation and output fluctuate? • How do central bankers use interest rates to achieve their stabilization objectives?

3. Output, Inflation, & Monetary Policy: Roadmap • Output and inflation in the long run • Monetary policy and the quantity of real output demanded • Inflation and the quantity of real output supplied • Output and inflation in equilibrium

4. Output and Inflation in the Long Run: Potential Output • What the economy is capable of producing when its resources are used at normal rates • Unexpected events can push current output away from potential output, creating an output gap • In the long run, current output equals potential output (Y=YP).

5. Output and Inflation in the Long Run: Long-Run Inflation • Recall: MV = PY implies %M + %V = %P + %Y • Ignoring changes in velocity, %V=0,In the long run Y=YP, so %Y= %YP %P = %M - %YP Inflation = Money growth – growth in potential output

6. Inflation refers to a sustained rise in prices that continues for a substantial period. • Temporary increases in inflation represent one-time adjustments in the price-level

7. Dynamic Aggregate Demand • Aggregate Expenditure & the Real Interest Rate:Real Interest Rate   Aggregate Exp.  • Inflation, the Real Interest Rate and Monetary PolicyInflation   Real Interest Rate  • Dynamic Aggregate DemandInflation   Aggregate Exp. 

8. Dynamic Aggregate Demand

9. The Nominal and Real Federal Funds Rate Economic decisions depend on real interest rates. In the short-run, changes in the nominal interest rate change the real interest rate

10. Aggregate Expenditure &the Real Interest Rate Aggregate Gov’t Net Expenditure = Consumption + Investment + Purchases + Exports Yad = C + I + G + NX When the real interest rate rises: C: reward to saving rises, C falls I : cost of financing rises, I falls NX: demand for domestic assets rises, currency appreciated, imports rise, exports fall, X-M falls

11. Aggregate Expenditure and the Real Interest Rate

12. Aggregate Expenditure and the Real Interest Rate

13. Fluctuations in investment are one of the most important sources of changes in aggregate expenditure.

14. The Long-Run Real Interest Rates • What happens to the real interest rate in the long run? • Look for the real interest rate at which aggregate expenditure equals potential output.

15. The Long-Run Real Interest Rate

16. Changes in the Long-Run Real Interest Rate • Long-run real interest rate changes when • Aggregate expenditure shiftsAn increase in components of aggregate expenditure that are not sensitive to the real interest rate raises r* • Potential output changes An increase in potential output lowers r*

17. Changes in the Long-Run Real Interest Rate

18. The Monetary Policy Reaction Curve • High Inflation:Policymakers raise the real interest rate • Current output below potential outputPolicymakers lower the real interest rate

19. The Monetary Policy Reaction Curve

20. The Monetary Policy Reaction Curve: Location • Monetary policy reaction curve is set so • current inflation equals target inflation • the real interest rate equals the long-run real interest rate.  = Twhenr = r*

21. The Monetary Policy Reaction Curve:Shifting the Curve • Change in the inflation target Reduction in Tshifts the MPRC to the left • Change in the long-run real interest rate An increase in r*shifts the MPRC to the left

22. The Monetary Policy Reaction Curve:Shifting the Curve

23. The Monetary Policy Reaction Curve:Summary

24. Inflation and Output:Dynamic Aggregate Demand

25. Dynamic Aggregate Demand • When inflation rises • Policymakers raise the real interest rate along their monetary policy reaction curve • Higher real interest means lower aggregate output demanded Inflation  Output

26. Dynamic Aggregate Demand

27. Dynamic Aggregate Demand Curve:Shifting the Curve • Changing interest insensitive components of Aggregate Expenditure • Shifting the MPRC

28. Dynamic Aggregate Demand Curve:Shifting the Curve • Changing interest insensitive components of Aggregate Expenditure Portion of C insensitive to r  Y  (at all r): AD shifts right

29. Dynamic Aggregate Demand Curve:Shifting the Curve • Shifting the MPRC • Inflation Target Higher *means lower r at every  Lower r means higher Y*   r  (at every )  Y  AD shifts to the right

30. Dynamic Aggregate Demand Curve:Shifting the Curve • Shifting the MPRC • Inflation Target*   r  (at every )  Y  AD shifts to the right • Long-run Real Interest Rate Higher r*   r  (at every )  Y  AD shifts to the right

31. Dynamic Aggregate Demand Curve:Shifting the Curve

32. Dynamic Aggregate Demand Curve:Summary

33. When nominal interest rates are high, chances are that inflation is high, too. • If you are living off interest or investment income, you can be fooled into thinking that your income is high. • Spending all of the interest income causes a gradual decline in the purchasing power of your savings. • To maintain real purchasing power of your income, you can only spend the real return.

34. Aggregate Supply • Short run: SRAS • Long run: LRAS

35. Short-Run Aggregate Supply When  changes, what do supplier do?Input prices (wages, etc.) adjust slowlyCosts fixed: higher prices  higher profits

36. Short-Run Aggregate Supply

37. Short-Run Aggregate Supply:Shifting the Curve • Deviations of Current Output from Potential • Expansionary Gap  Scare Resources • Changes in Expectations of Future Inflation • Higher Expected Inflation  Increases costs • Factors that Change Production Costs • Higher production costs  shifts SRAS right

38. Short-Run Aggregate Supply:Shifting the Curve

39. A 1 percentage point recessionary output gap drives inflation down 0.2 percentage points 18 months later

40. Long-Run Aggregate Supply • What happens when adjustments finish? • Where does SRAS stop shifting? • When Y = YP

41. Long-Run Aggregate Supply

42. Aggregate Supply:Summary

43. Policymakers talk about output growth • Textbooks teach about output gaps • To reconcile the two realize that when %Y  %YP it creates an output gap

44. Determination of Output & Inflation:Short-Run Equilibrium Inflation and Output are determined by intersection of AD and SRAS

45. Adjustment to Long-Run Equilibrium • Output > Potential (Y>YP): SRAS shifts left until Y=YP • Output < Potential (Y<YP): SRAS shifts right until Y=YP