What would be the impact of an unanticipated increase in aggregate demand on an economy’s rate of unemployment, rate of inflation, and the short-run Phillips curve (SRPC) Unemployment Inflation SRPC（）①A. Decrease Increase Upward movement along curve ②B. Increase Increase Downward movement along curve ③C. No effectDecrease Upward shift of curve
A. ①
B. ②
C. ③
参考答案：A
解析：
Assume that the expected inflation rate is 8 percent a year and that the natural rate of unemployment is 5 percent for an economy. An unanticipated increase in aggregate demand will cause firms to hire more workers in the short-run. That action should reduce the economy’s unemployment rate below its natural rate. However, as aggregate demand increases the inflation rate will increase. This joint action would result in an upward movement along the short-run Phillips curve.