Question

which of these equations is right?
a. private cost = external cost + social cost
c. social cost = private cost + external cost
d. social cost = private cost × external cost
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multiple choice

Explanation:

在经济学中，社会成本（Social cost）的定义是私人成本（Private cost）与外部成本（External cost）之和。选项A和B的公式逻辑错误，选项D的乘法关系不符合社会成本的定义。

Answer:

C. Social cost = private cost + external cost