[单选题]

As output quantities expand in an industry with a downward-sloping long-run industry supply curve, what is the most likely long-run effect on the equilibrium selling price per unit of the industry's output?

A.Increase,because of upward pressure on input prices.

B.Decrease,because of lower input costs per unit of output.

C.No effect,because selling price is only affected in the short run.

参考答案与解析:

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