Which of the following statements about aggregate demand is correct?单项选择题

A

In the short run, shifts in aggregate demand do not affect the overall price level and output

B

In the short run, shifts in aggregate demand affect the overall price level but do not affect output

C

In the long run, shifts in aggregate demand cause fluctuations in output

D

In the long run, shifts in aggregate demand affect the overall price level but do not affect output

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