[CFA入门] 请教经济学问题(附一道题) 经济学, 题, equivalent, benefit, product

dotamasta

对于经济学教材中的几个术语一直弄不清，marginal return, marginal revenue, marginal benefit, 这三者有何区别呢？
那么下面一道题：
The value of one more unit of a product is equivalent to that unit's marginal :
A cost
B benefit
C revenue

非常感谢，答案选B