NO.PZ2018062003000040
问题如下：
In a perfectly competitive market, If one supplier reduces its output by 5% and wants to increase price by 5% then:
选项：
A. his total revenue will reduce by 5%.
B. his average revenue will reduce by 5%.
C. his total revenue will reduce by less than 5%.
解释：
A is correct.
The unit sales change of a single supplier in a perfectly competitive market has no influence on the market price. Thus, a reduce of 5% in output will reduce the revenue at 5% as well.
考点：完全竞争市场下厂商的总收入
解析：在完全竞争的市场条件下，P=MR
虽然题目中的厂商把单位售价提高5%，但是农场品市场是完全竞争市场，厂家只是价格的被动接受者。到最后改厂商只能以原价格卖出产品。但是产量减少了5%,所以总收入减少了5%。B,C选项说法都不对。
减产提价后的TR=(1+5%)P*(1-5%)Q=(1-0.25%)PQ,要大于(1-5%)PQ，所以TR的下降要less than5%，应该选C啊。就算像答案说的在完全竞争市场，单一厂商无法决定价格，最后还是会降价到原价格，但是那也是长期的事，他从提完价到降价也会有个过程，所以绝不可能完全只受减产的影响，一点也不受到提价的影响。
