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Cournot's model of competition is typically presented for the case of a duopoly market structure; the following example provides a straightforward analysis of the Cournot model for the case of Duopoly. Therefore, suppose we have a market consisting of only two firms which we will call firm 1 and firm 2.
A Cournot duopoly is a model of strategic interaction between two firms where they simultaneously choose their output levels, assuming the rival's output level is fixed. The firms compete on quantity, and each firm attempts to maximize its profit given the other firm's output level.
The Cournot duopoly model developed in his book also introduced the concept of a (pure strategy) Nash equilibrium, the reaction function and best-response dynamics. Cournot believed that economists must utilize the tools of mathematics only to establish probable limits and to express less stable facts in more absolute terms.
Duopoly, a case of an oligopoly where two firms operate and have power over the market. [8] Example: Aircraft manufactures: Boeing and Airbus. A duopoly in theory could have the same effect as a monopoly on pricing within a market if they were to collude on prices and or output of goods.
In oligopoly theory, conjectural variation is the belief that one firm has an idea about the way its competitors may react if it varies its output or price. The firm forms a conjecture about the variation in the other firm's output that will accompany any change in its own output.
Competition is well defined through the Cournot's model because, when there are infinite many firms in the market, the excess of price over marginal cost will approach to zero. [4] A duopoly is a special form of oligopoly where the market is made up of only two firms.
The accuracy of the predictions of each model will vary from industry to industry, depending on the closeness of each model to the industry situation. If capacity and output can be easily changed, Bertrand is generally a better model of duopoly competition. If output and capacity are difficult to adjust, then Cournot is generally a better model.
The first use of the Nash equilibrium was in the Cournot duopoly as developed by Antoine Augustin Cournot in his 1838 book. [4] Both firms produce a homogenous product: given the total amount supplied by the two firms, the (single) industry price is determined using the demand curve.