Supply duopoly

Japanese: 供給複占 - きょうきゅうふくせん
Supply duopoly

…Of the oligopolies in which there are multiple but few sellers of a certain good, when the number of sellers is two, it is called a duopoly or seller (supply) duopoly. The fact that the number of sellers is two and not three or more does not have any particular economic meaning. However, duopoly, the simplest case of oligopoly, is at the heart of oligopoly theory as it is the case that most clearly illustrates the problems of oligopoly. Unlike monopoly, where there is only one seller, or perfect competition, where there are an infinite number of sellers, in an oligopoly, a change in one's strategy affects the business environment of other sellers, inducing them to change their strategies. …

*Some of the terminology explanations that refer to "supply duopoly" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ある財の売手の数が複数ではあるが少数である寡占のうち,売手の数が2である場合をとくに複占または売手(供給)複占という。売手の数が2であって3以上でないことは,経済的にはとくに意味をもたない。しかし寡占のうち最も単純なケースである複占は,寡占のもつ問題を最も鋭角的に表すケースとして寡占理論の中心をなす。売手の数が1である独占や,売手の数が無数にある完全競争の場合と異なって,寡占の場合には自己の戦略の変更は他の売手の経営環境に影響を与え,その戦略の変更を誘発する。…

※「供給複占」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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