边际(英语:Margin)在经济学中指的是每一单位新增商品带来的效用,这就是生产或消费的边际。这个增量实际上是原函数的一个导函数[1]相关的一个概念是弹性,指的是某一应变量变化百分比与其影响因素变量变化百分比的比值。[注 1]

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