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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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MARGINAL REVENUE, MONOPOLISTIC COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a monopolistically competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a monopolistically competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time at a going out of business sale wanting to buy either 500 feet of telephone cable or a package of 4 by 6 index cards, the ones with lines. Be on the lookout for jovial bank tellers.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
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