邊際
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]
註釋
參見
參考
- ^ Wicksteed, Philip Henry. The Common Sense of Political Economy, Including a Study of the Human Basis of Economic Law. Macmillan and Company. 1910: Bk I Ch 2 and elsewhere (page 4 at econlib.org transcription).
Only at the margin is there a coincidence between the thing gained and the price paid for it.