邊際(英語:Margin)在經濟學中指的是每一單位新增商品帶來的效用,這就是生產或消費的邊際。這個增量實際上是原函數的一個導函數。[1]相關的一個概念是彈性,指的是某一應變量變化百分比與其影響因素變量變化百分比的比值。[註 1]
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