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[N. Gregory(N. Gregory Mankiw) Mankiw] Principles (BookFi)

E
CONOMY
1
E
CONOMY
2
(
PRICE STABILITY
)
(
INFLATION
)
Real interest rate
4%
4%
Inflation rate
0
8
Nominal interest rate
(real interest rate 
inflation rate)
4
12
Reduced interest due to 25 percent tax
(.25
nominal interest rate)
1
3
After-tax nominal interest rate
(.75
nominal interest rate)
3
9
After-tax real interest rate
(after-tax nominal interest 
rate 
inflation rate)
3
1


6 4 6
PA R T T E N
M O N E Y A N D P R I C E S I N T H E L O N G R U N
The taxes on nominal capital gains and on nominal interest income are two
examples of how the tax code interacts with inflation. There are many others.
Because of these inflation-induced tax changes, higher inflation tends to discour-
age people from saving. Recall that the economy’s saving provides the resources
for investment, which in turn is a key ingredient to long-run economic growth.
Thus, when inflation raises the tax burden on saving, it tends to depress the econ-
omy’s long-run growth rate. There is, however, no consensus among economists
about the size of this effect.
One solution to this problem, other than eliminating inflation, is to index the
tax system. That is, the tax laws could be rewritten to take account of the effects of
inflation. In the case of capital gains, for example, the tax code could adjust the
purchase price using a price index and assess the tax only on the real gain. In the
case of interest income, the government could tax only real interest income by ex-
cluding that portion of the interest income that merely compensates for inflation.
To some extent, the tax laws have moved in the direction of indexation. For exam-
ple, the income levels at which income tax rates change are adjusted automatically
each year based on changes in the consumer price index. Yet many other aspects of
the tax laws—such as the tax treatment of capital gains and interest income—are
not indexed.
In an ideal world, the tax laws would be written so that inflation would not
alter anyone’s real tax liability. In the world in which we live, however, tax laws
are far from perfect. More complete indexation would probably be desirable, but
it would further complicate a tax code that many people already consider too
complex.
C O N F U S I O N A N D I N C O N V E N I E N C E
Imagine that we took a poll and asked people the following question: “This year
the yard is 36 inches. How long do you think it should be next year?” Assum-
ing we could get people to take us seriously, they would tell us that the yard
should stay the same length—36 inches. Anything else would just complicate life
needlessly.
What does this finding have to do with inflation? Recall that money, as the
economy’s unit of account, is what we use to quote prices and record debts. In
other words, money is the yardstick with which we measure economic transac-
tions. The job of the Federal Reserve is a bit like the job of the Bureau of Stan-
dards—to ensure the reliability of a commonly used unit of measurement. When
the Fed increases the money supply and creates inflation, it erodes the real value
of the unit of account.
It is difficult to judge the costs of the confusion and inconvenience that arise
from inflation. Earlier we discussed how the tax code incorrectly measures real in-
comes in the presence of inflation. Similarly, accountants incorrectly measure
firms’ earnings when prices are rising over time. Because inflation causes dollars
at different times to have different real values, computing a firm’s profit—the dif-
ference between its revenue and costs—is more complicated in an economy with
inflation. Therefore, to some extent, inflation makes investors less able to sort out
successful from unsuccessful firms, which in turn impedes financial markets in
their role of allocating the economy’s saving to alternative types of investment.


C H A P T E R 2 8
M O N E Y G R O W T H A N D I N F L AT I O N
6 4 7
C A S E S T U D Y

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