ECON 1000 Chapter Notes - Chapter 16: Phillips Curve, Richard Lipsey, Aggregate Supply

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ECON 1000
Chapter 16: The Short-Run Trade-off between Inflation and Unemployment:
The Philips Curve:
Phillips curve: a curve that shows the short-run trade off between inflation and
unemployment
Origins of the Phillips Curve:
In 1958, New Zealand economist A. W. Phillips published an article, in it Phillips showed
a negative correlation between the rate of unemployment and the rate of inflation,
Phillips showed that years with low unemployment tend to have high inflation, and
years with high unemployment tend to have low inflation
Phillips concluded that, inflation and unemployment, were linked in a way that
economists had not previously appreciated
Two years later, Canadian economist Richard Lipsey confirmed and eteded Phillips’s
observations, Lipsey used quantitative methods to derive a more accurate estimate of
the change in inflation associated with particular rates of unemployment
Samuelson and Solow reasoned that the negative correlation between inflation and
unemployment that they found in U.S. data, arose because low unemployment was
associated with high aggregate demand and because high demand puts upward
pressure on wages and prices throughout the economy
Samuelson and Solow were interested in the Phillips curve because they believed that it
held important lessons for policymakers, they suggested that the Phillips curve offers
policymakers a menu of possible economic outcomes
By altering monetary and fiscal policy to influence aggregate demand, policymakers
could choose any point on this curve
Point A offers high unemployment and low inflation, point B offers low unemployment
and high inflation
Policymakers might prefer both low inflation and low unemployment, but the historical
data as summarized by the Phillips curve indicate that this combination is impossible
According to Samuelson and Solow, policymakers face a tradeoff between inflation and
unemployment, and the Phillips curve illustrates that tradeoff
The Phillips curve illustrates a negative association between the inflation rate and the
unemployment rate
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Aggregate Demand, Aggregate Supply, and the Phillips Curve:
The Phillips curve shows the combinations of inflation and unemployment that arise in
the short run as shifts in the aggregate-demand curve move the economy along the
short-run aggregate-supply curve
Shifts in aggregate demand push inflation and unemployment in opposite directions in
the short run, a relationship illustrated by the Phillips curve
How the Phillips Curve is Related to the Model of Aggregate Demand and Aggregate Supply:
This figure assumes a price level of 100 for the year 2020 and charts possible outcomes
for the year 2021
(a) shows the model of aggregate demand and aggregate supply, if aggregate demand is
low, the economy is at point A; output is low (7500), and the price level is low (102)
If aggregate demand is high, the economy is at point B; output is high (8000), and the
price level is high (106)
(b) shows the implications for the Phillips curve
Point A, which arises when aggregate demand is low, has high unemployment (7%) and
low inflation (2%)
Point B, which arises when aggregate demand is high, has low unemployment (4%) and
high inflation (6%)
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Monetary and fiscal policy can move the economy along the Phillips curve
Increases in the money supply, increases in government spending, or cuts in taxes
expand aggregate demand and move the economy to a point on the Phillips curve with
lower unemployment and higher inflation
Decreases in the money supply, cuts in government spending, or increases in taxes
contract aggregate demand and move the economy to a point on the Phillips curve with
lower inflation and higher unemployment
The Phillips curve offers policymakers a menu of combinations of inflation and
unemployment
Shifts in the Phillips Curve: The Role of Expectations:
The Long-Run Phillips Curve:
According to Friedman and Phelps, there is no tradeoff between inflation and
unemployment in the long run
Growth in the money supply determines the inflation rate
Regardless of the inflation rate, the unemployment rate gravitates toward its natural
rate
As a result, the long-run Phillips curve is vertical
How the Long-Run Phillips Curve is Related to the Model of aggregate Demand and Aggregate
Supply:
When expansionary monetary policy shifts the aggregate demand curve to the right, the
equilibrium moves from point A to point B, the price level rises, while output remains
the same
The long-run Phillips curve, is vertical at the natural rate of unemployment
Expansionary monetary policy moves the economy from lower inflation to higher
inflation without changing the rate of unemployment
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Document Summary

Chapter 16: the short-run trade-off between inflation and unemployment: The philips curve: phillips curve: a curve that shows the short-run trade off between inflation and unemployment. In 1958, new zealand economist a. w. phillips published an article, in it phillips showed a negative correlation between the rate of unemployment and the rate of inflation, Shifts in the phillips curve: the role of expectations: How the long-run phillips curve is related to the model of aggregate demand and aggregate. Supply: when expansionary monetary policy shifts the aggregate demand curve to the right, the equilibrium moves from point a to point b, the price level rises, while output remains the same. The long-run phillips curve, is vertical at the natural rate of unemployment: expansionary monetary policy moves the economy from lower inflation to higher inflation without changing the rate of unemployment. The short-run phillips curve: unemployment rate = natural rate of unemployment (actual inflation expected inflation)

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