Once People Believe the Fed's Commitment to Keep Unemployment at the Natural

Multiple Choice

Once people believe the Fed's commitment to keep unemployment at the natural rate,the Fed can reduce unemployment below the natural rate

A) in both the short run and the long run.
B) in both the short run and the long run, but only after changing peoples' expectations.
C) in the long run, but not the short run.
D) in the short run, but not in the long run.
E) none of the above