EC120 Lecture Notes - Lecture 12: Economic Surplus, Marginal Revenue, Price Discrimination

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30 Jan 2018
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Why do monopolies exist: a monopoly is a firm that is the sole seller of a product without close substitutes, natural entry barriers, created entry barriers. Natural entry barriers: one large firm produces more efficiently than small firms, average total cost is downward sloping, eg. Monopolies vs. competitive firms: maintain assumption of profit maximization. For a monopolist: marginal revenue is not equal to price: to inncrease quantity - must find new buyers (move along the demand curve, to find buyers, firms must lower prices. Marginal revenue: total revenue is p*q, average revnue = price, change in revenue due a quantity is a trade-off. For a monopolist: marginal revenue is not equal to price. Examples of price discrimination: airpline pricing, coupon clipping, quantity discounts. Firms can set price - market power: consumers have different values for the same product, arbitrage is limited or prevented (prevent people buying a product and selling it to the other group)

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