11. Which of the following statements is true?
(A)In the long run, the average cost curve is always downward sloping.
(B) In the long run, the quantities of all inputs are fixed.
(C)In the long run, the firms' fixed costs are greater than its variable costs.
(D)In the long run, all costs are variable costs.

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這題在考什麼觀念 本題測驗考生對短期與長...
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