For each of the following situations, draw a Phillips curve graph with a vertical line at the natural rate of unemployment, and assume that the economy is initially at the natural rate of unemployment. Show how each of the events would either cause the Phillips curve to shift or how the event would cause the economy to move to a different point along the same Phillips curve.

a. Oil prices rise

b. There is a decrease in Aggregate Demand

c. There is an increase in expected inflation