单选题 Equilibrium in a perfectly competitive market results in a quantity for which the: A. difference between consumer and producer surpluses is maximized. B. consumer and producer surpluses are equal. C. sum of consumer and producer surpluses is maximized.

【正确答案】 C

【答案解析】In a competitive market, the equilibrium quantity is the one tot which the sum of the consumer and producer surpluses is maximized.