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Copyright 2004 South-Western
35The Short-Run
Tradeoff betweenInflation and
Unemployment
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Unemployment and Inflation The natural rate of unemployment depends on
various features of the labor market.
Examples include minimum-wage laws, the
market power of unions, the role of efficiencywages, and the effectiveness of job search.
The inflation rate depends primarily on growth
in the quantity of money, controlled by the Fed.
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Unemployment and Inflation Society faces a short-run tradeoff between
unemployment and inflation.
If policymakers expand aggregate demand, they
can lower unemployment, but only at the costof higher inflation.
If they contract aggregate demand, they can
lower inflation, but at the cost of temporarilyhigher unemployment.
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THE PHILLIPS CURVE ThePhillips curve illustrates the short-run
relationship between inflation and
unemployment.
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Figure 1 The Phillips Curve
Unemployment
Rate (percent)
0
Inflation
Rate
(percent
per year)
Phillips curve
4
B6
7
A2
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Aggregate Demand, Aggregate Supply, andthe Phillips Curve The Phillips curve shows the short-run
combinations of unemployment and inflation
that arise as shifts in the aggregate demand
curve move the economy along the short-runaggregate supply curve.
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Aggregate Demand, Aggregate Supply, andthe Phillips Curve The greater the aggregate demand for goods
and services, the greater is the economys
output, and the higher is the overall price level.
A higher level of output results in a lower levelof unemployment.
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Figure 2 How the Phillips Curve is Related toAggregate Demand and Aggregate Supply
Quantity
of Output
0
Short-run
aggregate
supply
(a) The Model of Aggregate Demand and Aggregate Supply
Unemployment
Rate (percent)
0
Inflation
Rate
(percentper year)
Price
Level
(b) The Phillips Curve
Phillips curve
Low aggregate
demand
High
aggregate demand
(output is
8,000)
B
4
6
(output is
7,500)
A
7
2
8,000
(unemployment
is 4%)
106 B
(unemployment
is 7%)
7,500
102 A
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SHIFTS IN THE PHILLIPS CURVE:THE ROLE OF EXPECTATIONS
The Phillips curve seems to offer policymakers
a menu of possible inflation and unemployment
outcomes.
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The Long-Run Phillips Curve In the 1960s, Friedman and Phelps concluded
that inflation and unemployment are unrelated
in the long run.
As a result, the long-run Phillips curve is vertical atthe natural rate of unemployment.
Monetary policy could be effective in the short run
but not in the long run.
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Figure 3 The Long-Run Phillips Curve
Unemployment
Rate0 Natural rate of
unemployment
Inflation
Rate Long-run
Phillips curve
BHigh
inflation
Low
inflation
A
2. . . . but unemployment
remains at its natural rate
in the long run.
1. When theFed increases
the growth rate
of the money
supply, the
rate of inflation
increases . . .
Copyright 2004 South-Western
Fi 4 H th Philli C i R l t d t
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Figure 4 How the Phillips Curve is Related toAggregate Demand and Aggregate Supply
Quantity
of Output
Natural rate
of output
Natural rate of
unemployment
0
Price
Level
P
Aggregate
demand, AD
Long-run aggregate
supply
Long-run Phillips
curve
(a) The Model of Aggregate Demand and Aggregate Supply
Unemployment
Rate
0
Inflation
Rate
(b) The Phillips Curve
2. . . . raises
the price
level . . .
1. An increase in
the money supply
increases aggregate
demand . . .
A
AD2
B
A
4. . . . but leaves output and unemployment
at their natural rates.
3. . . . and
increases the
inflation rate . . .P2
B
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Expectations and the Short-Run PhillipsCurve Expected inflation measures how much people
expect the overall price level to change.
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Expectations and the Short-Run PhillipsCurve In the long run,expected inflation adjusts to
changes in actual inflation.
The Feds ability to create unexpected inflation
exists only in the short run. Once people anticipate inflation, the only way to get
unemployment below the natural rate is for actual
inflation to be above the anticipated rate.
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This equation relates the unemployment rate to
the natural rate of unemployment, actual
inflation, and expected inflation.
Expectations and the Short-Run PhillipsCurve
Natural rate of unemployment - a Actualinflation ExpectedinflationUnemployment Rate =
Fi 5 H E t d I fl ti Shift th Sh t
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Figure 5 How Expected Inflation Shifts the Short-Run Phillips Curve
Unemployment
Rate
0 Natural rate of
unemployment
Inflation
Rate Long-run
Phillips curve
Short-run Phillips curve
with high expected
inflation
Short-run Phillips curve
with low expected
inflation
1. Expansionary policy moves
the economy up along the
short-run Phillips curve . . .
2. . . . but in the long run, expected
inflation rises, and the short-runPhillips curve shifts to the right.
CB
A
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The Natural Experiment for the Natural-RateHypothesis The view that unemployment eventually returns
to its natural rate, regardless of the rate of
inflation, is called the natural-rate hypothesis.
Historical observations support the natural-ratehypothesis.
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The Natural Experiment for the Natural RateHypothesis The concept of a stable Phillips curve broke
down in the in the early 70s.
During the 70s and 80s, the economy
experienced high inflation and highunemployment simultaneously.
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Figure 6 The Phillips Curve in the 1960s
1 2 3 4 5 6 7 8 9 100
2
4
6
8
10
Unemployment
Rate (percent)
Inflation Rate
(percent per year)
1968
1966
19611962
1963
1967
19651964
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Figure 7 The Breakdown of the Phillips Curve
1 2 3 4 5 6 7 8 9 100
2
4
6
8
10
Unemployment
Rate (percent)
Inflation Rate
(percent per year)
1973
1966
1972
1971
19611962
1963
1967
1968
1969 1970
1965
1964
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SHIFTS IN THE PHILLIPS CURVE:THE ROLE OF SUPPLY SHOCKS
Historical events have shown that the short-runPhillips curve can shift due to changes in
expectations.
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SHIFTS IN THE PHILLIPS CURVE:THE ROLE OF SUPPLY SHOCKS
The short-run Phillips curve also shifts becauseof shocks to aggregate supply.
Major adverse changes in aggregate supply can
worsen the short-run tradeoff betweenunemployment and inflation.
An adversesupply shock gives policymakers a less
favorable tradeoff between inflation and
unemployment.
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SHIFTS IN THE PHILLIPS CURVE:THE ROLE OF SUPPLY SHOCKS
Asupply shock is an event that directly altersthe firms costs, and, as a result, the prices they
charge.
This shifts the economys aggregate supplycurve. . .
. . . and as a result, the Phillips curve.
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Figure 8 An Adverse Shock to Aggregate Supply
Quantity
of Output
0
Price
Level
Aggregate
demand
(a) The Model of Aggregate Demand and Aggregate Supply
Unemployment
Rate
0
Inflation
Rate
(b) The Phillips Curve
3. . . . and
raises
the price
level . . .
AS2 Aggregate
supply,AS
A
1. An adverse
shift in aggregate
supply . . .
4. . . . giving policymakers
a less favorable tradeoff
between unemploymentand inflation.
BP2
Y2
PA
Y
Phillips curve,P
C
2. . . . lowers output . . .
PC2
B
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SHIFTS IN THE PHILLIPS CURVE:THE ROLE OF SUPPLY SHOCKS
In the 1970s, policymakers faced two choiceswhen OPEC cut output and raised worldwide
prices of petroleum.
Fight the unemployment battle by expandingaggregate demand and accelerate inflation.
Fight inflation by contracting aggregate demand
and endure even higher unemployment.
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Figure 9 The Supply Shocks of the 1970s
1 2 3 4 5 6 7 8 9 100
2
4
6
8
10
Unemployment
Rate (percent)
Inflation Rate
(percent per year)
1972
19751981
1976
1978
1979
1980
1973
1974
1977
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THE COST OF REDUCINGINFLATION
To reduce inflation, the Fed has to pursuecontractionary monetary policy.
When the Fed slows the rate of money growth,
it contracts aggregate demand.
This reduces the quantity of goods and services
that firms produce.
This leads to a rise in unemployment.
Figure 10 Disinflationary Monetary Policy in the
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Figure 10 Disinflationary Monetary Policy in theShort Run and the Long Run
Unemployment
Rate
0 Natural rate of
unemployment
InflationRate
Long-run
Phillips curve
Short-run Phillips curvewith high expected
inflation
Short-run Phillips curve
with low expectedinflation
1. Contractionary policy moves
the economy down along the
short-run Phillips curve . . .
2. . . . but in the long run, expected
inflation falls, and the short-run
Phillips curve shifts to the left.
BC
A
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THE COST OF REDUCINGINFLATION
To reduce inflation, an economy must endure aperiod of high unemployment and low output.
When the Fed combats inflation, the economy
moves down the short-run Phillips curve. The economy experiences lower inflation but at the
cost of higher unemployment.
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THE COST OF REDUCINGINFLATION
Thesacrifice ratio is the number of percentagepoints of annual output that is lost in the
process of reducing inflation by one percentage
point. An estimate of the sacrifice ratio isfive.
To reduce inflation from about 10% in 1979-1981
to 4% would have required an estimated sacrifice of30% of annual output!
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Rational Expectations and the Possibility ofCostless Disinflation
The theory of rational expectations suggeststhat people optimally use all the information
they have, including information about
government policies, when forecasting thefuture.
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Rational Expectations and the Possibility ofCostless Disinflation Expected inflation explains why there is a
tradeoff between inflation and unemployment
in the short run but not in the long run.
How quickly the short-run tradeoff disappearsdepends on how quickly expectations adjust.
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Rational Expectations and the Possibility ofCostless Disinflation The theory of rational expectations suggests
that the sacrifice-ratio could be much smaller
than estimated.
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The Volcker Disinflation When Paul Volcker was Fed chairman in the
1970s, inflation was widely viewed as one of
the nations foremost problems.
Volcker succeeded in reducing inflation (from10 percent to 4 percent), but at the cost of high
employment (about 10 percent in 1983).
Fi 11 Th V l k Di i fl ti
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Figure 11 The Volcker Disinflation
1 2 3 4 5 6 7 8 9 100
2
4
6
8
10
Unemployment
Rate (percent)
Inflation Rate
(percent per year)
1980 1981
1982
1984
1986
1985
1979A
1983B
1987
C
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The Greenspan Era Alan Greenspans term as Fed chairman began
with a favorable supply shock.
In 1986, OPEC members abandoned their
agreement to restrict supply. This led to falling inflation and falling
unemployment.
Fi 12 Th G E
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Figure 12 The Greenspan Era
1 2 3 4 5 6 7 8 9 100
2
4
6
8
10
Unemployment
Rate (percent)
Inflation Rate
(percent per year)
19841991
1985
19921986
19931994
1988
19871995
199620021998
1999
20002001
19891990
1997
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The Greenspan Era Fluctuations in inflation and unemployment in
recent years have been relatively small due to
the Feds actions.
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Summary The Phillips curve describes a negative
relationship between inflation and
unemployment.
By expanding aggregate demand, policymakerscan choose a point on the Phillips curve with
higher inflation and lower unemployment.
By contracting aggregate demand,policymakers can choose a point on the Phillips
curve with lower inflation and higher
unemployment.
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Summary The tradeoff between inflation and
unemployment described by the Phillips curve
holds only in the short run.
The long-run Phillips curve is vertical at thenatural rate of unemployment.
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Copyright 2004 South-Western
Summary The short-run Phillips curve also shifts because
of shocks to aggregate supply.
An adverse supply shock gives policymakers a
less favorable tradeoff between inflation andunemployment.
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Summary When the Fed contracts growth in the money
supply to reduce inflation, it moves the
economy along the short-run Phillips curve.
This results in temporarily high unemployment. The cost of disinflation depends on how quickly
expectations of inflation fall.