# Money and Inflation. Money and Inflation U.S. inflation and its trend, % 3% 6% 9% 12% 15%

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Money and Inflation

U.S. inflation and its trend, 1960-2006
0% 3% 6% 9% 12% 15% 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 % change in CPI from 12 months earlier long-run trend

Money: Functions medium of exchange store of value unit of account

Money: Types 1. fiat money 2. commodity money has no intrinsic value
example: paper currency 2. commodity money has intrinsic value examples: gold coins, cigarettes in P.O.W. camps

The Federal Reserve Building Washington, DC
The central bank The Federal Reserve Building Washington, DC In the U.S., the central bank is called the Federal Reserve (“the Fed”). Open Market Operations are the primary monetary policy tool

Money supply measures, July 2009
symbol assets included amount (\$ billions) \$853 Currency C \$1655 C + demand deposits, travelers’ checks, other checkable deposits M1 \$8349 M1 + small time deposits, savings deposits, money market mutual funds, money market deposit accounts M2

The Quantity Theory of Money
A simple theory linking the inflation rate to the growth rate of the money supply. David Hume Milton Friedman

The quantity equation assumes V is constant & exogenous
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 M, therefore, determines the price level, P

The quantity theory of money
The quantity equation in growth rates:

The quantity theory of money
 (Greek letter “pi”) denotes the inflation rate: The result from the preceding slide was: Solve this result for  to get

The quantity theory of money
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.

The quantity theory of money
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.

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?

International data on inflation and money growth
Turkey Ecuador Indonesia Belarus Argentina U.S. Switzerland Singapore

U.S. inflation and money growth, 1960-2006
0% 3% 6% 9% 12% 15% 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 Over the long run, the inflation and money growth rates move together, as the quantity theory predicts. M2 growth rate inflation rate

Inflation and interest rates
Nominal interest rate, i not adjusted for inflation Real interest rate, r adjusted for inflation: r = i  

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. Note that S and I are real variables. In chapter 3, we learned about the factors that determine S and I. These factors did not include the money supply, velocity, inflation, or other nominal variables. Hence, in the classical (long-run) theory we are learning, changes in money growth or inflation do not affect the real interest rate. This is why there’s a one-for-one relationship between changes in the inflation rate and changes in the nominal interest rate. (Again, the Fisher effect does not imply that the nominal interest rate EQUALS the inflation rate. It implies that CHANGES in the nominal interest rate equal CHANGES in the inflation rate, given a constant value of the real interest rate.) Irving Fisher

Inflation and nominal interest rates in the U.S., 1955-2006
percent per year 15 nominal interest rate 10 5 inflation rate -5 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005

Inflation and nominal interest rates across countries
Romania Zimbabwe Brazil Bulgaria Israel Germany U.S. Switzerland

Exercise: Suppose V is constant, M is 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?

V is constant, M grows 5% per year, Y grows 2% per year, r = 4. a. First, find  = 5  2 = 3. Then, find i = r +  = = 7. b. i = 2, same as the increase in the money growth rate. c. If the Fed does nothing,  = 1. To prevent inflation from rising, Fed must reduce the money growth rate by 1 percentage point per year. Answers---the details: a. First, we need to find . Constant velocity implies  = (M/M) - (Y/Y) = = 3. Then, i = r +  = = 7. b. Changes in the money growth rate do not affect real GDP or its growth rate. So, a two-point increase in money growth causes a two-point increase in inflation. According to the Fisher effect, the nominal interest rate should rise by the increase in inflation: two points (from i=7 to i=9). c.  = (M/M) - (Y/Y). If (Y/Y) falls by 1 point, then  will increase by 1 point; the Fed can prevent this by reducing (M/M) by 1 point. Intuition: With slower growth in the economy, the volume of transactions will be growing more slowly, which means that the need for new money will grow more slowly.

The money demand function
(M/P )d = real money demand, depends negatively on i i is the opp. cost of holding money positively on Y higher Y  more spending  so, need more money (“L” is used for the money demand function because money is the most liquid asset.) An increase in the nominal interest rate represents the increase in the opportunity cost of holding money rather than bonds, and would motivate the typical consumer to hold less of his wealth in the form of money, and more in the form of bonds (or other interest-earning assets). An increase in real income (other things equal) causes an increase in the consumer’s consumption and therefore spending. To facilitate this extra spending, the consumer will require more money. Thus, the consumer would like a larger fraction of his wealth to be in the form of money (rather than bonds, etc). This might involve redeeming some of his bonds. Or it might simply involve holding the additional income in the form of money rather than putting it into bonds.

The money demand function
When people are deciding whether to hold money or bonds, they don’t know what inflation will turn out to be. Hence, the nominal interest rate relevant for money demand is r +  e.

The supply of real money balances
Equilibrium The supply of real money balances Real money demand

What determines what variable how determined (in the long run)
M exogenous (the Fed) r adjusts to make S = I Y P adjusts to make

Why is inflation bad? What costs does inflation impose on society? List all the ones you can think of. Focus on the long run.

A common misperception
Common misperception: inflation reduces real wages This is true only in the short run, when nominal wages are fixed by contracts. (Chap. 3) In the long run, the real wage is determined by labor supply and the marginal product of labor, not the price level or inflation rate. Consider the data…

Average hourly earnings and the CPI, 1964-2006
\$20 250 \$18 \$16 200 \$14 \$12 150 hourly wage \$10 CPI ( = 100) \$8 100 First, note that the CPI has risen tremendously over the past 40 years. However, nominal wages have risen by a roughly similar magnitude. If the common misperception were true, then the real wage should show exactly the opposite behavior as the CPI. It doesn’t. The real wage is not constant - it varies within the range of \$15 to \$19 - but there is no downward trend in the real wage over the long term. Note: We wouldn’t expect the real wage to be constant over the long run – we would expect it to change in response to shifts in the labor supply and MPL curves. source: BLS Obtained from: \$6 CPI (right scale) \$4 50 wage in current dollars \$2 wage in 2006 dollars \$0 1964 1970 1976 1982 1988 1994 2000 2006

The classical view of inflation
The classical view: A change in the price level is merely a change in the units of measurement. So why, then, is inflation a social problem?

The social costs of inflation
…fall into two categories: 1. costs when inflation is expected 2. costs when inflation is different than people had expected

The costs of expected inflation:
Shoeleather cost Menu costs Relative price distortions Unfair tax treatment General inconvenience

The cost of unexpected inflation:
Arbitrary redistribution of purchasing power Ex: From lenders to borrowers Increased uncertainty

One benefit of inflation
Nominal wages are rarely reduced, even when the equilibrium real wage falls. This hinders labor market clearing. Inflation allows the real wages to reach equilibrium levels without nominal wage cuts. Therefore, moderate inflation improves the functioning of labor markets.

Hyperinflation def:   50% per month
All the costs of moderate inflation described above become HUGE under hyperinflation. Money ceases to function as a store of value, and may not serve its other functions (unit of account, medium of exchange). People may conduct transactions with barter or a stable foreign currency.

Germany 1923

Zimbabwe 2008 November 2008 Inflation: 89,700,000,000,000,000,000,000%

What causes hyperinflation?
Hyperinflation is caused by excessive money supply growth: When the central bank prints money, the price level rises. If it prints money rapidly enough, the result is hyperinflation.

A few examples of hyperinflation
money growth (%) inflation (%) Israel, 295 275 Poland, 344 400 Brazil, 1350 1323 Argentina, 1264 1912 Peru, 2974 3849 Nicaragua, 4991 5261 Bolivia, 4208 6515

Why governments create hyperinflation
When a government cannot raise taxes or sell bonds, it must finance spending increases by printing money. In theory, the solution to hyperinflation is simple: stop printing money. In the real world, this requires drastic and painful fiscal restraint.

The Classical Dichotomy
Real variables: Measured in physical units – quantities and relative prices, for example: quantity of output produced real wage: output earned per hour of work real interest rate: output earned in the future by lending one unit of output today Nominal variables: Measured in money units, e.g., nominal wage: Dollars per hour of work. nominal interest rate: Dollars earned in future by lending one dollar today. the price level: The amount of dollars needed to buy a representative basket of goods.

The Classical Dichotomy
Note: Real variables were explained in Chap 3, nominal ones in Chapter 4. Classical dichotomy: the theoretical separation of real and nominal variables in the classical model, which implies nominal variables do not affect real variables. Neutrality of money: Changes in the money supply do not affect real variables. In the real world, money is approximately neutral in the long run.

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