ECO 120 Lecture Notes - Lecture 22: Marginal Revenue, Sunk Costs, Market Power

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Characteristics of perfect competition: many buyers and sellers, goods offered for sale are largely the same, firms can freely enter or exit the market, each buyer and seller is a price taker. Revenue of a competitive firm: total revenue (tr) = p x q, average revenue (ar) = tr/q = p, marginal revenue (mr) = changetr/changeq, mr = p. The change in tr from selling one more unit. Competitive firm can increase it"s output without affecting its market price. Each one-unit increase in q causes revenue to rise by p. Only true for firms in competitive markets. If q increases by one unit, revenue rises by mr, cost rises by mc. Think at the margin: if mr>mc , then increase q to raise profit, if mr

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