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PERFECT COMPETITION, SHORT-RUN PRODUCTION ANALYSIS: A perfectly competitive firm produces the profit-maximizing quantity of output that equates marginal revenue and marginal cost. This production level can be identified using total revenue and cost, marginal revenue and cost, or profit. Because a perfectly competitive firm faces a perfectly elastic demand curve, it efficiently allocates resources by equating price and marginal cost. In addition, the marginal cost curve above the average variable cost curve is the perfectly competitive firm's short-run supply curve.

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ELASTICITY ALTERNATIVES, SUPPLY

Five categories of the price elasticity of supply that reflect the entire range of the relative responsiveness of a change in quantity supplied to a change in price. These five alternatives--perfectly elastic, relatively elastic, unit elastic, relatively inelastic, and perfectly inelastic--are often illustrated by different supply curves. The price elasticity of demand is also reflected by five comparable alternatives.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a large green chalkboard shaped like the state of Maine or a replacement battery for your pocket calculator. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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The average bank teller loses about $250 every year.
"The true idealist pursues what his heart says is right in a way that his head says will work. "

-- Richard Nixon, 37th US president

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