Final answer:
Expansionary monetary policy can stimulate higher growth rate of real output in the short run, but not in the long run.
Step-by-step explanation:
Expansionary monetary policy can stimulate a higher growth rate of real output in the long run. In the short run, it can help the economy return to its potential GDP by reducing interest rates and stimulating investment and consumption spending. This causes the aggregate demand curve to shift to the right, resulting in increased output and employment. However, in the long run, people adjust their inflationary expectations to actual inflation, so sustained expansionary policies can lead to inflation without permanently increasing output and employment.