对边际效用递减规律的再认识

Recognition of the Law of Diminishing Marginal Utility

边际效用递减规律是微观经济学中效用理论的重要基础,但关于边际效用递减规律是否具有普遍性,当前学术界还存在不少争论。不少学者举出一些疑似边际效用递增的例子对该规律进行质疑,认为它存在例外现象。边际效用递减规律有严格的前提条件,而众多质疑的例子基本都忽略了其前提条件。在严格的前提条件下,边际效用递减规律是必然成立的。

The law of diminishing marginal utility is the foundation of utility theory of microeconomics. There are lots of disputes about it in academia. Some scholars gave some examples appearing to be increasing marginal utility to oppugn it. They deemed that there are some exceptions to the law. The foundation of the law has strict preconditions but all the oppugners neglected it. It is certain that the law is true on the strict preconditions.