单选题 Which of the following statements is most accurate in describing total surplus with respect to a product or service?
A. Price minus marginal cost, summed over the quantity bought.
B. Marginal benefit minus price, summed over the quantity bought.
C. Marginal benefit minus marginal cost, summed over the quantity bought.

【正确答案】 C

【答案解析】[解析] 总剩余(total surplus)是消费者剩余(consumer surplus)加上生产者剩余(producer surplus)，即将边际收益减去边际成本，在所有购买量上的加总。消费者剩余是边际收益减去价格，在所有购买量上的加总。生产者剩余是价格减去边际成本，在所有购买量上的加总。