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In economics, ''homo economicus'', or economic man, is the concept in many economic theories portraying humans as consistently rational and narrowly self-interested agents who usually pursue their subjectively-defined ends optimally. Generally, ''homo economicus'' attempts to maximize utility as a consumer and profit as a producer.〔Rittenberg and Trigarthen. Principles of Microeconomics: Chapter 6. pp. 2 () Accessed June 20, 2012〕 This theory stands in contrast to the concepts of (e.g.) behavioral economics (which examines actual economic behavior, including widespread cognitive biases and other irrationalities), and ''homo reciprocans'' (which emphasizes human cooperation). == History of the term == The term "economic man" was used for the first time in the late nineteenth century by critics of John Stuart Mill’s work on political economy.〔Persky, Joseph. "Retrospectives: The Ethology of Homo Economicus." ''The Journal of Economic Perspectives'', Vol. 9, No. 2 (Spring, 1995), pp. 221-231〕 Below is a passage from Mill’s work that those 19th-century critics were referring to: "(economy ) does not treat the whole of man’s nature as modified by the social state, nor of the whole conduct of man in society. It is concerned with him solely as a being who desires to possess wealth, and who is capable of judging the comparative efficacy of means for obtaining that end."〔Mill, John Stuart. "On the Definition of Political Economy, and on the Method of Investigation Proper to It," London and Westminster Review, October 1836. ''Essays on Some Unsettled Questions of Political Economy'', 2nd ed. London: Longmans, Green, Reader & Dyer, 1874, essay 5, paragraphs 38 and 48.〕 Later in the same work, Mill goes on to write that he is proposing “an arbitrary definition of man, as a being who inevitably does that by which he may obtain the greatest amount of necessaries, conveniences, and luxuries, with the smallest quantity of labour and physical self-denial with which they can be obtained.” Although the term did not come into use until the 19th century, it is often associated with the ideas of 18th century thinkers like Adam Smith and David Ricardo. In ''The Wealth of Nations'', Smith wrote: "It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest."〔Smith, Adam. “On the Division of Labour,” The Wealth of Nations, Books I-III. New York: Penguin Classics, 1986, page 119〕 This suggests the same sort of rational, self-interested, labor-averse individual that Mill proposes (although Smith did claim that individuals have sympathy for the well-being of others, in ''The Theory of Moral Sentiments''). Aristotle's ''Politics'' discussed the nature of self-interest in Book II, Part V.〔http://classics.mit.edu/Aristotle/politics.html〕 "Again, how immeasurably greater is the pleasure, when a man feels a thing to be his own; for surely the love of self is a feeling implanted by nature and not given in vain, although selfishness is rightly censured; this, however, is not the mere love of self, but the love of self in excess, like the miser's love of money; for all, or almost all, men love money and other such objects in a measure. And further, there is the greatest pleasure in doing a kindness or service to friends or guests or companions, which can only be rendered when a man has private property." A wave of economists in the late 19th century—Francis Edgeworth, William Stanley Jevons, Léon Walras, and Vilfredo Pareto—built mathematical models on these assumptions. In the 20th century, Lionel Robbins’ rational choice theory came to dominate mainstream economics and the term economic man took on a more specific meaning of a person who acted rationally on complete knowledge out of self-interest and the desire for wealth. 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「Homo economicus」の詳細全文を読む スポンサード リンク
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