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Discuss examples where different models might be the most appropriate think for example of market for raw materials or for air travel In this essay I am going to discuss models of oligopoly behaviour and analyse them and see whether they are realistic or not and evaluate them with certain examples where they may be most suitable Oligopoly is defined as a market form in which a market is dominated by a small number of sellers There are many different models for oligopoly behaviour such as the Cournot Solution the Sweezy Kinked Demand Curve Solution the Stackelberg Model and the Bertrand Model The Cournot model focuses on the behaviour of quantities prices and profits within a duopoly if two firms are selling products in the same market Within this model it is assumed that one firm will not react to all changes from the other firms decision Firm 1 can choose an output of p1 assuming firm 2 had a fixed level of output at p2 The same assumption can be made the other way for example p2 is chosen supposing that p1 can be treated by the second firm as given Within oligopolistic markets there are a huge number of firms so this hypothesis makes sense as firms can make their decisions without basing it on anothers decision However on the other hand even though it is in a duopoly in the Cournot equilibrium other firms will still notice change of the other firms if quantities are not changing Another way to analyse the Cournot equilibrium mathematically is to say the industry demand curve is An isoprofit curve is the locus of points in a space defined by different levels of output for both firms 1 and 2 which yield the same level of profit to firm 1 They are generally concave and the level of profits decline with the height of the isoprofit curve above the horizontal axis
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