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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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FACTORY

The physical capital (building and equipment) at a particular location used for the production of goods and services. A factory, or plant, is usually a relatively large production operation (compared with something smaller, like a shop). While factory and firm are occasionally used synonymously they are not really the same. A given firm might own more than factory and a given factory might be owned by more than one firm.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a pair of designer sunglasses or looseleaf notebook paper. Be on the lookout for door-to-door salesmen.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
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