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duopoly
A true duopoly (from Greek ''duo'' δύο (two) + ''polein'' πωλεῖν (to sell)) is a specific type of oligopoly where only two producers exist in one market. In reality, this definition is generally used where only two firms have dominant control over a market. In the field of industrial organization, it is the most commonly studied form of oligopoly due to its simplicity.
==Duopoly models in economics==
There are two principal duopoly models, Cournot duopoly and Bertrand duopoly:
* The Cournot model, which shows that two firms assume each other's output and treat this as a fixed amount, and produce in their own firm according to this.
* The Bertrand model, in which, in a game of two firms, each one of them will assume that the other will not change prices in response to its price cuts. When both firms use this logic, they will reach a Nash equilibrium.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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