ECON 20A Lecture Notes - Lecture 7: Market Power, Sunk Costs, Decision Rule

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7 Apr 2016
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The goods offered for sale are largely the same. Firms can freely enter or exit the market. Because of 1 & 2, each buyer and seller is a price taker takes the price as given. Firms can freely enter or exit the market means there are no barriers or impediments to entry or exit. E. g. , the government does not restrict the number of firms in the market. Mr = p for a competitive firm: a competitive firm can keep increasing its output without affecting the market price. So, each one-unit increase in q causes revenue to rise by p, i. e. , mr = p. *** mr = p is only true for firms in competitive markets. Profit maximization: what q maximizes the firm"s profit, to find the answer, think marginally. If increase q by one unit, revenue rises by mr, cost rises by mc. If mr > mc, then increase q to raise profit.

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