Which of the following is least accurate regarding the allocative efficiency associated with price discrimination Price discrimination:（）
A. results in gains to the discriminating firm by selling to consumers with relatively inelastic demand.
B. increases production closer to the quantity where price equals marginal cost.
C. leads to a decrease in allocative efficiency.
参考答案：C
解析：
Allocative efficiency occurs when the quantity produced maximizes the sum of consumer and producer surplus. That is, where marginal benefit equals marginal cost. Price discrimination reduces the allocative inefficiency that exists when prices are greater than marginal cost by increasing output toward the quantity where price equals marginal cost. Firms gain by selling to customers with inelastic demand while still providing goods to customers with more elastic demand. This may even cause production to take place at a level where it would not take place otherwise.