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In economics, a monopsony (from Ancient Greek μόνος (''mónos'') "single" + ὀψωνία (''opsōnía'') "purchase") is a market form in which only one buyer interfaces with many would-be sellers of a particular product. The microeconomic theory of imperfect competition assumes the monopsonist has market power and can influence terms of offer to its sellers, as the only purchaser of a good or service, much in the same manner that a monopolist can influence the price for its buyers in a monopoly, in which only one seller faces many buyers. In addition to its use in microeconomic theory, ''monopsony'' and ''monopsonist'' are descriptive terms often used to describe a market where a single buyer substantially controls the market as the major purchaser of goods and services. Examples include the fish auction (one single entity buys fish from all fishermen to then resell it to distributors), military industry,〔 〕 space industry,〔 〕 and the government-funded and government-regulated prison industry. ==Etymology== The term was first introduced by Joan Robinson in her influential book, ''The Economics of Imperfect Competition'', published in 1933. Robinson credited classics scholar Bertrand Hallward at the University of Cambridge with coining the term. 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「monopsony」の詳細全文を読む スポンサード リンク
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