Polypoly

Japanese: polipoly
Polypoly

...Here again, we will use game theory to explain a simple example to clarify the fundamental problem with oligopoly.
[Strategic selection and prediction of rival actions]
Consider a situation where two companies (A and B) are sharing the market for a certain product (an oligopoly with two sellers is called a duopoly). If each seller can choose between two strategies (actions), high price and low price, the market state can be divided into four cases depending on the price that A and B set.

*Some of the terminology explanations that mention "polipoly" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ここでも,ゲーム理論を使って簡単な例を説明することで,寡占の本質的問題点を明らかにしよう。
[戦略の選択とライバル行動の予測]
 いま二つの企業(A,B)がある商品の市場を分け合っている状態を考える(このように売手の数が二つである寡占をとくに〈複占polipoly〉と呼ぶ)。それぞれの売手が高価格と低価格という二つの戦略(行動)のどちらかだけを選べるとすると,市場の状態はA,Bそれぞれがどの価格をつけるかで,四つのケースに分けることができる。…

※「polipoly」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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