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A marginal value is #a value that holds true given particular constraints, #the ''change'' in a value associated with a specific change in some independent variable, whether it be of that variable or of a dependent variable, or #(underlying values are quantified ) the ''ratio'' of the change of a dependent variable to that of the independent variable. (This third case is actually a special case of the second). In the case of differentiability, at the limit, a marginal change is a mathematical differential, or the corresponding mathematical derivative. These uses of the term “marginal” are especially common in economics, and result from conceptualizing constraints as ''borders'' or as ''margins''.〔Wicksteed, Philip Henry; (''The Common Sense of Political Economy'' (1910), ) (Bk I Ch 2 and elsewhere ).〕 The sorts of marginal values most common to economic analysis are those associated with ''unit'' changes of resources and, in mainstream economics, those associated with ''infinitesimal'' changes. Marginal values associated with units are considered because many decisions are made by unit, and marginalism explains ''unit price'' in terms of such marginal values. Mainstream economics uses infinitesimal values in much of its analysis for reasons of mathematical tractability. == Quantified conception == Assume a functional relationship : 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「marginal value」の詳細全文を読む スポンサード リンク
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