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:''This article concerns a concept of economic theory. For discussion of the term “margin” as used in the jargon of bourses, see “Margin (finance)”.'' In economics, a margin is a set of constraints conceptualised as a ''border''.〔Wicksteed, Philip Henry; (''The Common Sense of Political Economy'' (1910), ) (Bk I Ch 2 and elsewhere ).〕 A ''marginal change'' is the change associated with a relaxation or tightening of constraints — either change ''of'' the constraints, or a change ''in response to'' this change of the constraints.〔 == Extensive and intensive margins == Margins are sometimes conceptualized as ''extensive'' or ''intensive'': *An extensive margin corresponds to the number of usable inputs that are in some sense employed. For example, hiring an additional worker would increase an extensive margin. *An intensive margin corresponds to the amount of use extracted within a given extensive margin. For example, reducing required production from a given set of workers would decrease the intensive margin. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Margin (economics)」の詳細全文を読む スポンサード リンク
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