76. The short run is characterized by A. plenty of time for firms to either enter or leave the industry. B. increasing but not diminishing returns. C. fixed plant capacity. D.  zero fixed costs.单项选择题

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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

14. Which of the following companies has the longest short run? A.    A bakery B.    A band C.    A phone app company D.    A tulip grower

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.

Assume a certain firm regards the number of workers it employs as variable but regards the size of its factory as fixed. This assumption is often realistic

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