为什么不是设置在marginal cost之上呢

问题如下：

A government entity that regulates an authorized monopoly will most likely base regulated prices on:

选项：

A.

marginal cost.

B.

long run average cost.

C.

first degree price discrimination.

解释：

B is correct.

This allows the investors to receive a normal return for the risk they are taking in the market.

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。