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举一反三
【单选题】If firms are making positive economic profits in the short run, then in the long run:
A.
the short-run industry supply curve will shift leftward.
B.
firms will enter the industry.
C.
industry output will rise and the price will rise.
D.
firms will leave the industry.
【单选题】If aggregate demand decreases and neither short-run nor long-run aggregate supply changes, then
A.
the price level increases in the short-run and decreases in the long-run.
B.
there is an inflationary gap.
C.
there is a recessionary gap.
D.
in the long run, the long-run aggregate supply will decrease.