单选题 Monetarists believe that:

A. shifts in aggregate demand arise from changes in expectations.
B. monetary policy has a significant impact on aggregate demand.
C. money wages tend to adjust quickly when aggregate supply and aggregate demand are in disequilibrium.

【正确答案】 B

【答案解析】Monetarists believe that monetary policy has a significant impact on aggregate demand. Because of timing problems, most monetarists believe that discretionary monetary policy should not be used to stabilize the economy. Keynesian economists believe shifts in aggregate demand arise primarily from changes in expectations. Classical economists believe money wages tend to adjust quickly; both monetarists and Keynesians believe wages are "downward sticky. "