What Impact Will a Permanent Decrease in the Supply of a Major

Multiple Choice

What impact will a permanent decrease in the supply of a major input have on real output?

A) It will increase real output in both the short run and the long run.
B) It will increase real output in the short run but not in the long run.
C) It will decrease real output in the short run but not the long run.
D) It will decrease real output in both the short run and the long run.