5.    The main difference between the short run and the long run is that: A.    firms earn zero profits in the long run. B.    the long run always refers to a time period of one year or longer. C.    in the long run, only one variable can be fixed. D.    in the short run, one or more inputs is fixed.单项选择题

A

A

B

B

C

C

D

D

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Part 1What is the short​ run? What is the long​ run? Part 1In​ economics, the short run is the time frame in which​ _______ and the long run is the period of time in which​ _______. A. the quantities of all factors of production are​ fixed; the quantities of all factors of production can be varied B. the quantities of some factors of production are​ variable; the quantities of all factors of production are fixed C. the quantities of all factors of production are variable but technology is​ fixed; sunk costs are variable D. the quantities of some factors of production are​ fixed; the quantities of all factors of production can be varied

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