问题
单项选择题
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.
答案
参考答案：C
解析：
In a competitive market, the equilibrium quantity is the one tot which the sum of the consumer and producer surpluses is maximized.
