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PERFECT COMPETITION, REVENUE DIVISION: The marginal approach to analyzing a perfectly competitive firm's short-run profit maximizing production decision can be used to identify the division of total revenue among variable cost, fixed cost, and economic profit. The U-shaped cost curves used in this analysis provide all of the information needed on the cost side of the firm's decision. The demand curve facing the firm (which is also the firm's average revenue and marginal revenue curves) provides all of the information needed on the revenue side.

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PERFECT COMPETITION, 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 its positively-sloped marginal cost curve in response to changing prices.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a combination CD player, clock radio, and telephone (with answering machine) or a revolving spice rack. Be on the lookout for high interest rates.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"He who hesitates is poor. "

-- Mel Brooks, writer, director, comedian

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