问题如下图：老师好，这道题我只知道regulated prices based on MC或者ATC是吗？这道题考点和再详细的解题思路能给下吗
选项：
A. 
B. 
C. 
解释：
NO.PZ2018062003000076 问题如下 For authorizemonopoly backegovernment, the prices of its procts are likely to regulatein accornwith: A.long run margincost. B.long run average cost. C.short run average cost. B is correctFor authorizemonopoly, the regulateprices are baseon long run average cost, so ththe investors creceive a normprofit .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。 如上，做起来很懵
NO.PZ2018062003000076 long run average cost. short run average cost. B is correFor authorizemonopoly, the regulateprices are baseon long run average cost, so ththe investors creceive a normprofit . 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。 既然说到实务，那长期成本在实务中如何测算？能有准确的数字么？
为啥不是Short Run AC？
