EC120 Lecture Notes - Monopolistic Competition, Zero Zero (Comics), Deadweight Loss

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20 Dec 2013
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EC120 Full Course Notes
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Differentiated products are everywhere; examples of monopolistic competition abound. 2 extremes between monopoly and competition: perfect competition: many firms, identical products, monopoly: one firm. Oligopoly: only a few sellers offer similar/identical products. Monopolistic competition: may firms sell similar but not identical products. Characteristics of monopolistic competition: many sellers (firms, product differentiation, free entry and exit. Gas: location is a critical dimension of product differentiation. Flatter d and mr curves than monopolist due to competition. To maximize profit, firm produces q where mr = mc, and uses d to set p. It is a loss if p < atc. Short run: under monopolistic competition, firm behaviour is similar to monopoly. Long run: in monopolistic competition, entry and exit drive economic profit to zero (p = atc) If profits in sr: new firms enter, taking d away from existing firms, p and profits fall. Monopolistic competition less efficient than perfect competition: excess capacity.

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