NO.PZ2018062003000036
问题如下：
Which of the following descriptions about normal profit is incorrect?
选项：
A.It is the difference between total revenue and total explicit cost.
B.It is minimum requirement for a firm to continue operating in the long run.
C.It is the accounting profit that makes economic profit zero.
解释：
A is correct.
Accounting profit rather than normal profit is the difference between total revenue and total explicit cost.
考点：Normal profit
解析：
正常利润应该等于收入减去显性成本的同时还要减去隐性成本。A选项入选
正常利润就是经济利润为0时候的利润，如果企业想要在长期维持生存就必须获取正常利润，所以B，C选项不入选。
题目对A选项入选的解释是这样的：
"正常利润应该等于收入减去显性成本的同时还要减去隐性成本。A选项入选"
首先，正常利润是否就是Normal Profit ？
如果是，给出的解释错误在于： Total revenue - Explicit cost - Implicit cost 应该等于Economic Profit，而不是Normal Profit。
A选项入选的原因，我认为应该是这么解释：
讲义中，关于Normal Profit的定义是这样的：Normal Profit is the accounting profit that makes economic profit zero.
那么也就是说，Normal Profit 是当 Economic Proft利润为0时，Normal Profit = Accounting profit. 而Accounting profit = total revenue - explicit cost, 也就是说，A选项其实说的：It is the difference between total revenue and total explicit cost. 是需要在 Economic profit 为0时才成立。这个才应该是A选项不对，而入选的原因。
