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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 SUPPLIED

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

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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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