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Monopolistic Competition

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Monopolistic competition: An evolutionary approach

EXECUTIVE SUMMARY

This term paper shows that a monopolistically competitive equilibrium can evolve without purposive profit maximization. Firms exit the industry if they fail to pass the survival test of making nonnegative wealth. Industry converges in probability to the monopolistically competitive equilibrium as the size of each firm becomes small relative to the market, as the entry cost becomes sufficiently small, and as time gets sufficiently large. Consequently, in the limit, the only surviving firms are those producing at the tangency of the demand curve to the average cost curve and no potential entrant can make a positive profit by entry.

Introduction

The criterion by which the economic system selects survivors: those who realize profits are the survivors; those who suffer losses disappear. In the late 1920s and early 1930s it became apparent that there were severe limitations in conducting economic analysis using a framework of either pure competition or pure monopoly. Consequently, economists began shifting their attention to middle ground between monopoly and perfect competition. One of the most notable achievements was Chamberlin’s, 1933 blending of elements of perfect competition and pure monopoly in a notion of ‘‘large group’’ monopolistic competition where there are many competing firms producing similar but different commodities which are not perfect substitutes. Because of the product differentiation each firm has a certain degree of monopoly power (i.e., faces a downward-sloping demand curve). The presence of a product group with free entry leads the industry to a long-run zero profit situation of active firms. The corresponding output is where the firms’ demand curves are tangent to their respective average cost curves. This same equilibrium corresponds to where firms

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