In this paper we analyzed the main aspects of oligopoly, in the case of n firms. The analysis has made, as a rule, for arbitrary marginal costs, each time, however, by considering these costs constant recovering well known results of the models presented: the Stackelberg model, the case of more production leaders, the price leader, the Cournot equilibrium for duopoly, the Cournot equilibrium for oligopoly or in the case of perfect competition and cartels. We also treat the problems above for the general case of cost function, again customizing the overall results for linear functions and obtaining the corresponding classical relations.
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