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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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CHANGE IN QUANTITY DEMANDED

A movement along a given demand curve caused by a change in demand price. The only factor that can cause a change in quantity demanded is price. A related, but distinct, concept is a change in demand.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway seeking to buy either a remote controlled train set or a genuine down-filled snow parka. Be on the lookout for the last item on a shelf.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"Posterity: you will never know how much it has cost my generation to preserve your freedom. I hope you will make good use of it. "

-- John Quincy Adams, 6th U. S. president

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United Nations Conference on Trade and Development
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