15.In the long run, a competitive firm has
(A) an economic profit， and so does a monopoly.
(B) an economic profit, but a monopoly does not.
(C) no economic profit., but a monopoly might.
(D) no economic profit’‘ and neither does a monopoly.

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統計： A(0), B(0), C(2), D(0), E(0) #1424901