单项选择题:
An analyst does research about marginal benefit and marginal cost. If the government sets a production quota below equilibrium, which of the following statements is most accurate The effect at the quota quantity is that:（）
A. marginal cost exceeds market price.
B. marginal benefit exceeds market price.
C. marginal benefit exceeds marginal cost.
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答案：C
解析: 边际成本就是供给曲线，边际收益就是需求曲线，在配额产量的区域，边际收益超过边际成本。