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A full oligopoly is one in which a price leader is not present in the market, and where firms enjoy relatively similar market control. A partial oligopoly is one where a single firm dominates an industry through saturation of the market, producing a high percentage of total output and having large influence over market conditions.
Joseph Louis François Bertrand (1822–1900) developed the model of Bertrand competition in oligopoly. This approach was based on the assumption that there are at least two firms producing a homogenous product with constant marginal cost (this could be constant at some positive value, or with zero marginal cost as in Cournot).
In these alternative models of oligopoly, a small number of firms earn positive profits by charging prices above cost. Suppose two firms, A and B, sell a homogeneous commodity, each with the same cost of production and distribution, so that customers choose the product solely on the basis of price. It follows that demand is infinitely price ...
An oligopoly may engage in collusion, either tacit or overt to exercise market power and manipulate prices to control demand and revenue for a collection of firms. A group of firms that explicitly agree to affect market price or output is called a cartel , with the organization of petroleum-exporting countries ( OPEC ) being one of the most ...
Firms have partial control over the price as they are not price takers (due to differentiated products) or Price Makers (as there are many buyers and sellers). [5] Oligopoly refers to a market structure where only a small number of firms operate together control the majority of the market share. Firms are neither price takers or makers.
The intensity of price competition is another good measure of how much control a firm within a market structure has over price. The Herfindahl Index provides a measure of firm concentration within a market and is the sum of the squared market shares of all the firms in the market (Herfindahl Index = (S i ) 2 , where S i = market share of firm i) .
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.
Oligopoly is a market structure that is highly concentrated. 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