单选题
编号：2692214
1. 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.