EC120 Lecture Notes - Lecture 15: Market Power, Monopolistic Competition, Profit Maximization

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4 Apr 2016
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EC120 Full Course Notes
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Debate over role of brand name products. Oligopoly: only a few sellers of similar or idenical products. Monopolisic compeiion: many irms sell similar but not idenical products. Concentraion raio: the % of total output in the market supplied by the biggest 4 irms. Examples and characterisics of monopolisic compeiion: many sellers, product difereniaion, free entry and exit. Because the product is diferent from those of other irms. To maximize proits the irm produces where mr=mc. The irm follows monopolist"s rule for proit maximizaion. Long run: in monopolisic compeiion, entry and exit drive economic proit to zero. If a irm proits in the short run: Taking some demand away from exising irms (demand curve to the let) If irm incurs losses in the short run: Remaining irms enjoy higher demand and prices demand curve to the right. Entry and exit occurs unil p = atc and proit = 0.

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