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SHORT-RUN SUPPLY CURVE: For a perfectly competitive firm, the marginal cost curve that lies above the average variable cost curve. This segment of the marginal cost guides a perfectly competitive firm's profit maximizing production as it equates price to marginal cost. Because the marginal cost curve is positively sloped (due to the law of diminishing marginal returns), each firm's supply curve and the market supply curve are also positively sloped. The law of diminishing marginal returns thus provides an explanation for the law of supply. However, this only works for firms with NO market control. Monopoly, monopolistic competition, and oligopoly, with market control, do not achieve the same result.

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DEMAND CURVE

A graphical representation of the relation between the demand price and quantity demanded, holding all ceteris paribus demand determinants constant. A demand curve graphically illustrates the law of demand, the inverse relation between demand price and quantity demanded for a particular good. It is one half of the standard market model; a supply curve is the other half.

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Today, you are likely to spend a great deal of time at the confiscated property police auction seeking to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for crowded shopping malls.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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