ECN 301 Lecture Notes - Lecture 11: Phillips Curve, Unemployment, Empirical Relationship

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Isaiah Ferris Fall 2017
ECN301 Lecture 11 Notes
Unemployment and Inflation
o The Phillips curve is a negative empirical relationship between unemployment and inflation.
o In 1970-2009 there seemed to be no reliable relationship between unemployment and
inflation.
o
o
The Expectations Augmented Phillips Curve
o A negative relationship should exist between unanticipated inflation and cyclical
unemployment.
o If increase in M is anticipated, and if there is no misperception, the economy remains at Y,
unemployment remains at u, and cyclical unemployment is zero.
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Isaiah Ferris Fall 2017
o If increase in M is unanticipated, unanticipated inflation is created, Y is above Y, and u is
below u.
o h measures the strength of the relationship between unanticipated inflation and cyclical
unemployment.
o The expectation-augeted Phillips ue states that if π eeeds πe the u is less tha u.
h is related to the slope of the SRAS curve.
Shifting of the Philips Curve
o The Phillips curve depends on the expected rate of inflation and the natural rate of
unemployment. If either factor changes the Phillips curve will shift.
Changes in the Expected Rate of Inflation
o If households anticipate a change in the price level they respond by their expectations of the
price level (the rate of inflation) one-for-one.
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Isaiah Ferris Fall 2017
o The Phillips curve shifts up by the amount of the increase in the expected rate of inflation.
Changes in the Natural Rate of Unemployment
o An increase in the natural unemployment rate causes the Phillips curve to shift up and to
the right.
Supply Shocks and the Phillips Curve
o An adverse supply shock causes a burst of inflation and raises the natural rate of
unemployment:
by increasing the degree of mismatch between workers and jobs (classical
economists);
by reducing MPN and labour demanded at full employment (Keynesian economists).
o An adverse supply shock should shift the Phillips curve up and to the right.
o The Phillips curve should be unstable particularly during periods of supply shocks.
The Shifting Phillips Curve in Practice
o The Friedman-Phelps analysis shows that a negative relationship between the levels of
inflation and unemployment holds as long as expected inflation and the natural
unemployment rate are approximately constant.
o During 1970-2009 there was a number of productivity shocks as well as changes in
government and macroeconomic policies.
o A negative relationship between unanticipated inflation and cyclical unemployment does
appear in the data.
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Document Summary

Ecn301 lecture 11 notes: unemployment and inflation, the phillips curve is a negative empirical relationship between unemployment and inflation. In 1970-2009 there seemed to be no reliable relationship between unemployment and inflation: the expectations augmented phillips curve, a negative relationship should exist between unanticipated inflation and cyclical unemployment. If increase in m is anticipated, and if there is no misperception, the economy remains at y, unemployment remains at u, and cyclical unemployment is zero. Shifting of the philips curve: the phillips curve depends on the expected rate of inflation and the natural rate of unemployment. If either factor changes the phillips curve will shift: changes in the expected rate of inflation. If households anticipate a change in the price level they respond by their expectations of the price level (the rate of inflation) one-for-one. = e a(cid:374)d u=u: the long-run phillips curve is vertical line at u=u. In a fraction-reserve banking system the reserve-deposit ratio reserves divided by deposits.

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