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PERFECT COMPETITION, PROFIT MAXIMIZATION: A perfectly competitive firm is presumed to produce the quantity of output that maximizes economic profit--the difference between total revenue and total cost. This production decision can be analyzed directly with economic profit, by identifying the greatest difference between total revenue and total cost, or by the equality between marginal revenue and marginal cost.

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MARGINAL COST AND LAW OF DIMINISHING MARGINAL RETURNS

Decreasing then increasing marginal cost, reflected by a U-shaped marginal cost curve, is the result of increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of short-run production. This translates into a positively-sloped supply curve for profit-maximizing competitive firms.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store wanting to buy either a bottle of blackcherry flavored spring water or a travel case for you toothbrush. Be on the lookout for mail order catalogs with hidden messages.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"Life is not a 'brief candle.' It is a splendid torch that I want to make burn as brightly as possible before handing it on to future generations. "

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