Assume that an economy is initially at the natural rate of unemployment. a. Use a Phillips curve diagram to illustrate graphically how the inflation rate and unemployment rate change both in the short run and in the long run to an unexpected expansionary monetary policy. b. Use a Phillips curve diagram to illustrate graphically how the inflation rate and unemployment rate change both in the short run and in the long run to the announcement of a credible plan of expansionary monetary policy when people have rational expectations.

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