请问考试出现这类型的题目应该怎么准确判断呢？讲义里的知识点在哪里？

问题如下：

For an authorized monopoly backed by government, the prices of its products are likely to be regulated in accordance with:

选项：

A.

long run marginal cost.

B.

long run average cost.

C.

short run average cost.

解释：

B is correct

For an authorized monopoly, the regulated prices are based on long run average cost, so that the investors can receive a normal profit .

考点：垄断监管

解析： 对于监管机构而言，通常要求厂商把价格设定在商品ATC的水平上，如此，价格刚好可以抵消总成本，厂商获得正常利润，可以一直存续下去。