4.    In the short run, output: A.    is absolutely fixed. B.    can vary as the result of using a fixed amount of plant and equipment more or less intensively. C.    may be altered by varying the size of plant and equipment that now exist in the industry. D.    can vary as the result of changing the size of existing plants and by new firms entering or leaving the industry.单项选择题

A

A

B

B

C

C

D

D

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