Money Growth and
Inflation
Lecture 5
17.3.2015
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THE CLASSICAL THEORY OF
INFLATION
• Inflation is an increase in the overall level of
prices.
• Hyperinflation is an extraordinarily high rate of
inflation.
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THE CLASSICAL THEORY OF
INFLATION
• Inflation: Historical Aspects
• Over the past 60 years, prices have risen on average
about 5 percent per year.
• Deflation, meaning decreasing average prices,
occurred in the U.S. in the nineteenth century.
• Hyperinflation refers to high rates of inflation such
as Germany experienced in the 1920s.
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THE CLASSICAL THEORY OF
INFLATION
• The quantity theory of money is used to explain
the long-run determinants of the price level and
the inflation rate.
• Inflation is an economy-wide phenomenon that
concerns the value of the economy’s medium of
exchange.
• When the overall price level rises, the value of
money falls.
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Money Supply, Money Demand, and
Monetary Equilibrium
• The money supply is a policy variable that is
controlled by the Fed.
• Through instruments such as open-market
operations, the Fed directly controls the quantity of
money supplied.
• Money demand has several determinants,
including interest rates and the average level of
prices in the economy.
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Money Supply, Money Demand, and
Monetary Equilibrium
• People hold money because it is the medium of
exchange.
• The amount of money people choose to hold
depends on the prices of goods and services.
• In the long run, the overall level of prices
adjusts to the level at which the demand for
money equals the supply.
Figure 1 Money Supply, Money Demand, and the
Equilibrium Price Level
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Quantity of
Money
Value of
Money, 1/P
Price
Level, P
Quantity fixed
by the Fed
Money supply
0
1
(Low)
(High)
(High)
(Low)
1
/2
1
/4
3
/4
1
1.33
2
4
Equilibrium
value of
money
Equilibrium
price level
Money
demand
A
Figure 2 The Effects of Monetary Injection
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Quantity of
Money
Value of
Money, 1/P
Price
Level, P
Money
demand
0
1
(Low)
(High)
(High)
(Low)
1
/2
1
/4
3
/4
1
1.33
2
4
M1
MS1
M2
MS2
2. . . . decreases
the value of
money . . .
3. . . . and
increases
the price
level.
1. An increase
in the money
supply . . .
A
B
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THE CLASSICAL THEORY OF
INFLATION
• The Quantity Theory of Money
• How the price level is determined and why it might
change over time is called the quantity theory of
money.
• The quantity of money available in the economy
determines the value of money.
• The primary cause of inflation is the growth in the
quantity of money.
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The Classical Dichotomy and Monetary
Neutrality
• Nominal variables are variables measured in
monetary units.
• Real variables are variables measured in
physical units.
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The Classical Dichotomy and Monetary
Neutrality
• According to Hume and others, real economic
variables do not change with changes in the
money supply.
• According to the classical dichotomy, different
forces influence real and nominal variables.
• Changes in the money supply affect nominal
variables but not real variables.
• The irrelevance of monetary changes for real
variables is called monetary neutrality.
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Velocity and the Quantity Equation
• The velocity of money refers to the speed at
which the typical dollar bill travels around the
economy from wallet to wallet.
V = (P  Y)/M
• Where: V = velocity
P = the price level
Y = the quantity of output
M = the quantity of money
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Velocity and the Quantity Equation
• Rewriting the equation gives the quantity
equation:
M  V = P  Y
• The quantity equation relates the quantity of
money (M) to the nominal value of output
(P  Y).
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Velocity and the Quantity Equation
• The quantity equation shows that an increase in
the quantity of money in an economy must be
reflected in one of three other variables:
• the price level must rise,
• the quantity of output must rise, or
• the velocity of money must fall.
Figure 3 Nominal GDP, the Quantity of Money,
and the Velocity of Money
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Indexes
(1960 = 100)
2,000
1,000
500
0
1,500
1960 1965 1970 1975 1980 1985 1990 1995 2000
Nominal GDP
Velocity
M2
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Velocity and the Quantity Equation
• The Equilibrium Price Level, Inflation Rate,
and the Quantity Theory of Money
• The velocity of money is relatively stable over time.
• When the Fed changes the quantity of money, it
causes proportionate changes in the nominal value
of output (P  Y).
• Because money is neutral, money does not affect
output.
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CASE STUDY: Money and Prices during
Four Hyperinflations
• Hyperinflation is inflation that exceeds 50
percent per month.
• Hyperinflation occurs in some countries
because the government prints too much money
to pay for its spending.
Figure 4 Money and Prices During Four
Hyperinflations
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(a) Austria (b) Hungary
Money supply
Price level
Index
(Jan. 1921 = 100)
Index
(July 1921 = 100)
Price level
100,000
10,000
1,000
100
19251924192319221921
Money supply
100,000
10,000
1,000
100
19251924192319221921
Figure 4 Money and Prices During Four
Hyperinflations
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(c) Germany
1
Index
(Jan. 1921 = 100)
(d) Poland
100,000,000,000,000
1,000,000
10,000,000,000
1,000,000,000,000
100,000,000
10,000
100
Money
supply
Price level
19251924192319221921
Price level
Money
supply
Index
(Jan. 1921 = 100)
100
10,000,000
100,000
1,000,000
10,000
1,000
19251924192319221921
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The Inflation Tax
• When the government raises revenue by
printing money, it is said to levy an inflation
tax.
• An inflation tax is like a tax on everyone who
holds money.
• The inflation ends when the government
institutes fiscal reforms such as cuts in
government spending.
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The Fisher Effect
• The Fisher effect refers to a one-to-one
adjustment of the nominal interest rate to the
inflation rate.
• According to the Fisher effect, when the rate of
inflation rises, the nominal interest rate rises by
the same amount.
• The real interest rate stays the same.
Figure 5 The Nominal Interest Rate and the
Inflation Rate
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Percent
(per year)
1960 1965 1970 1975 1980 1985 1990 1995 2000
0
3
6
9
12
15
Inflation
Nominal interest rate
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THE COSTS OF INFLATION
• A Fall in Purchasing Power and Standards of
Living?
• Inflation does not in itself reduce people’s real
purchasing power.
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THE COSTS OF INFLATION
• Shoeleather costs
• Menu costs
• Relative price variability
• Tax distortions
• Confusion and inconvenience
• Arbitrary redistribution of wealth
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Shoeleather Costs
• Inflation reduces the real value of money, so
people have an incentive to minimize their cash
holdings.
• Shoeleather costs are the resources wasted
when inflation encourages people to reduce
their money holdings.
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Menu Costs
• A typical firm changes its price about once a
year.
• There are costs of adjusting prices - Menu costs
• During inflationary times, it is necessary to
update price lists and other posted prices.
• This is a resource-consuming process that takes
away from other productive activities (e.g.
deciding about new prices, printing new price
list, advertise new prices …).
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Inflation-Induced Tax Distortion
• Inflation exaggerates the size of capital gains
and increases the tax burden on this type of
income.
• The income tax treats the nominal interest
earned on savings as income, even though part
of the nominal interest rate merely compensates
for inflation.
Table 1 How Inflation Raises the Tax Burden on
Saving
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A Special Cost of Unexpected Inflation:
Arbitrary Redistribution of Wealth
• Unexpected inflation redistributes wealth
among the population in a way that has nothing
to do with either merit or need.
• These redistributions occur because many loans
in the economy are specified in terms of the
unit of account—money.
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Summary
• The overall level of prices in an economy
adjusts to bring money supply and money
demand into balance.
• When the central bank increases the supply of
money, it causes the price level to rise.
• Persistent growth in the quantity of money
supplied leads to continuing inflation.
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Summary
• The principle of money neutrality asserts that
changes in the quantity of money influence
nominal variables but not real variables.
• A government can pay for its spending simply
by printing more money.
• This can result in an “inflation tax” and
hyperinflation.
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Summary
• According to the Fisher effect, when the
inflation rate rises, the nominal interest rate
rises by the same amount, and the real interest
rate stays the same.
• Many people think that inflation makes them
poorer because it raises the cost of what they
buy.
• This view is a fallacy because inflation also
raises nominal incomes.