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In economics, the marginal utility of a good or service is the gain from an increase, or loss from a decrease, in the consumption of that good or service. Economists sometimes speak of a law of diminishing marginal utility, meaning that the first unit of consumption of a good or service yields more utility than the second and subsequent units, with a continuing reduction for greater amounts. The marginal decision rule states that a good or service should be consumed at a quantity at which the marginal utility is equal to the marginal cost.〔Rittenberg and Trigarthen. Principles of Microeconomics: Chapter 6. pp. 3 () Accessed June 20, 2012〕 == Marginality == The term ''marginal'' refers to a small change, starting from some baseline level. As Philip Wicksteed explained the term, :"Marginal considerations are considerations which concern a slight increase or diminution of the stock of anything which we possess or are considering"〔Wicksteed, Philip Henry; (''The Common Sense of Political Economy'' (1910), ) (Bk I Ch 2 and elsewhere ).〕 Frequently the marginal change is assumed to start from the endowment, meaning the total resources available for consumption (see Budget constraint). This endowment is determined by many things including physical laws (which constrain how forms of energy and matter may be transformed), accidents of nature (which determine the presence of natural resources), and the outcomes of past decisions made by the individual himself or herself and by others. For reasons of tractability, it is often assumed in neoclassical analysis that goods and services are continuously divisible. Under this assumption, marginal concepts, including marginal utility, may be expressed in terms of differential calculus. Marginal utility can then be defined as the first derivative of the total satisfaction obtained from consumption of a good or service, with respect to the amount of consumption of that good or service. In practice the smallest relevant division may be quite large. Sometimes economic analysis concerns the marginal values associated with a change of one unit of a discrete good or service, such as a motor vehicle or a haircut. For a motor vehicle, the total number of motor vehicles produced is large enough for a continuous assumption to be reasonable: this may not be true for, say, an aircraft carrier. 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 utility」の詳細全文を読む スポンサード リンク
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