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Chapter 4. Money and Inflation

Chapter 4. Money and Inflation. The classical theory of inflation causes effects social costs “Classical” – assumes prices are flexible & markets clear Applies to the long run. % change in CPI from 12 months earlier. U.S. inflation and its trend, 1960-2010.

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Chapter 4. Money and Inflation

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  1. Chapter 4. Money and Inflation • The classical theory of inflation • causes • effects • social costs • “Classical” – assumes prices are flexible & markets clear • Applies to the long run

  2. % change in CPI from 12 months earlier U.S. inflation and its trend, 1960-2010

  3. % change in CPI from 12 months earlier long-run trend U.S. inflation and its trend, 1960-2010

  4. The connection between money and prices • Inflation rate = percentage increase in the average level of prices • Price = amount of money required to buy a good

  5. Money: Definition Money is the stock of assets that can be readily used to make transactions.

  6. Money: Functions • medium of exchangewe use it to buy stuff • store of valuetransfers purchasing power from the present to the future • unit of accountthe common unit by which everyone measures prices and values

  7. Money: Types 1. Fiat money • has no intrinsic value • example: the paper currency we use 2. Commodity money • has intrinsic value • examples: gold coins, cigarettes in P.O.W. camps

  8. NOW YOU TRY:Discussion Question Which of these are money? a.Currency b.Checks c.Deposits in checking accounts (“demand deposits”) d.Credit cards e.Certificates of deposit (“time deposits”)

  9. Money supply, monetary policy • Money supply: the quantity of money available in the economy • Monetary policy: control over the money supply

  10. The Federal Reserve Building Washington, DC The central bank • Monetary policy is conducted by a country’s central bank. • In the U.S., the central bank is called the Federal Reserve(“the Fed”).

  11. C Currency $900 M1 C + demand deposits, travelers’ checks, other checkable deposits $1766 M2 M1 + small time deposits, savings deposits, money market mutual funds, money market deposit accounts $8709 Money supply measures, September 2010 symbol assets included amount ($ billions)

  12. The Quantity Theory of Money • A simple theory linking the inflation rate to the growth rate of the money supply. • Begins with the concept of velocity…

  13. Velocity • basic concept: the rate at which money circulates • definition: the number of times the average dollar bill changes hands in a given time period • example: In 2009, • $500 billion in transactions • money supply = $100 billion • The average dollar is used in five transactions in 2009 • So, velocity = 5

  14. Velocity, cont. • This suggests the following definition: where V = velocity T = value of all transactions M = money supply

  15. Velocity, cont. • Use nominal GDP as a proxy for total transactions. Then, where P = price of output (GDP deflator) Y = quantity of output (real GDP) P Y = value of output (nominal GDP)

  16. The quantity equation • The quantity equationM V = P Yfollows from the preceding definition of velocity. • It is an identity:it holds by definition of the variables.

  17. Money demand and the quantity equation • M/P = real money balances, the purchasing power of the money supply. • A simple money demand function: (M/P)d = kYwherek = how much money people wish to hold for each dollar of income. (kis exogenous)

  18. Money demand and the quantity equation • money demand: (M/P)d = kY • quantity equation: M V = P Y • The connection between them: k = 1/V • When people hold lots of money relative to their incomes (kis large), money changes hands infrequently (Vis small).

  19. Back to the quantity theory of money • starts with quantity equation • assumes V is constant & exogenous: Then, quantity equation becomes:

  20. The quantity theory of money, cont. How the price level is determined: • With V constant, the money supply determines nominal GDP (P Y ). • Real GDP is determined by the economy’s supplies of K and L and the production function (Chapter 3). • The price level is P = (nominal GDP)/(real GDP).

  21. The quantity theory of money, cont. • Recall from Chapter 2: The growth rate of a product equals the sum of the growth rates. • The quantity equation in growth rates:

  22. The quantity theory of money, cont.  (Greek letter “pi”) denotes the inflation rate: The result from the preceding slide: Solve this result for :

  23. The quantity theory of money, cont. • Normal economic growth requires a certain amount of money supply growth to facilitate the growth in transactions. • Money growth in excess of this amount leads to inflation.

  24. The quantity theory of money, cont. Y/Y depends on growth in the factors of production and on technological progress (all of which we take as given, for now). Hence, the Quantity Theory predicts a one-for-one relation between changes in the money growth rate and changes in the inflation rate.

  25. Confronting the quantity theory with data The quantity theory of money implies: 1. Countries with higher money growth rates should have higher inflation rates. 2. The long-run trend behavior of a country’s inflation should be similar to the long-run trend in the country’s money growth rate. Are the data consistent with these implications?

  26. International data on inflation and money growth Belarus Indonesia Inflation rate (percent, logarithmic scale) Turkey Ecuador Argentina Singapore Money supply growth(percent, logarithmic scale)

  27. M2 growth rate inflation rate U.S. inflation and money growth, 1960-2010

  28. U.S. inflation and money growth, 1960-2010 Inflation and money growth have the same long-run trends, as the Quantity Theory predicts.

  29. Seigniorage • To spend more without raising taxes or selling bonds, the govt can print money. • The “revenue” raised from printing money is called seigniorage (pronounced SEEN-your-idge). • The inflation tax:Printing money to raise revenue causes inflation. Inflation is like a tax on people who hold money.

  30. Inflation and interest rates • Nominal interest rate, inot adjusted for inflation • Real interest rate, radjusted for inflation:r = i 

  31. The Fisher effect • The Fisher equation:i = r +  • Chap 3: S = I determines r. • Hence, an increase in causes an equal increase in i. • This one-for-one relationship is called the Fisher effect.

  32. U.S. inflation and nominal interest rates, 1960-2010 nominal interest rate inflation rate

  33. Inflation and nominal interest rates across countries Nominal interest rate(percent, logarithmic scale) Romania Georgia Zimbabwe Turkey Brazil Israel Kenya U.S. Ethiopia Germany Inflation rate(percent, logarithmic scale)

  34. NOW YOU TRY:Applying the Theory Suppose V is constant, Mis growing 5% per year, Y is growing 2% per year, and r= 4. a. Solve for i. b. If the Fed increases the money growth rate by 2 percentage points per year, find i. c. Suppose the growth rate of Y falls to 1% per year. • What will happen to ? • What must the Fed do if it wishes to keep constant?

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