单选题
A、
In the short-term, there would be excess supply at a price of $40.
B、
In the long-run, if producers’ costs per unit decline, then a reasonable market clearing price could be $65.
C、
In the short-term, there would be excess demand at a price of $70.
D、
In the long-run, if producers’ costs per unit increase, then a reasonable market clearing price could be $70.
【正确答案】
D
【答案解析】
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