ECO100Y5 Lecture Notes - Lecture 12: Market Power, Network Effect, De Beers

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16 Apr 2016
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ECO100Y5 Full Course Notes
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A firm that is the only seller of a good or service that has no close substitutes. Barriers to entry lead to monopolies: government regulation: patents and licenses, control of a key resource of production: ex. Debeers and diamond mines: existence of network externalities: when good/service more valuable to consumer when more people use that good/service (ex. Facebook: existence of large economies of scale: as q increase, atc decrease. Firms can affect the price in the market. Firms do not face a perfectly elastic demand curve: firms in perfectly competitive markets have no market power. Firms with market power face a downward-sloping demand curve. Monopolies face the full market demand curve. If demand is elastic, a decrease in price increases total revenue - paper (2) If tr is increasing, then mr > 0. Therefore the monopolist will only produce on the elastic portion of the demand curve: where mr > 0.

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