ECON 110 Lecture Notes - Lecture 14: Marginal Revenue, Marginal Cost, Sunk Costs

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ECON 110 Full Course Notes
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Economic profit includes opportunity cost in total cost, unlike how accountants consider profit. Fixed costs: costs that don"t vary based on production. Variable costs: change according to quantity of production. Characteristics of perfect competition: many buyers and many sellers, the goods offered for sale are largely the same, firms can freely enter or exit the market, because of 1 and 2, no one has much control over price. Terms for perfect competition: total revenue = price x quantity, average revenue = (price x quantity) / quantity = price, marginal revenue = change in tr / change in q = price. Profit (pi) = tr tc: firms get to decide how much to produce, not the price. Calculating profit in perfect competition: total revenue = price x q, total cost = atc x q, pi (profit) = tr tc = (p x q*) (atc x q*) = (p atc) x q*

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