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MARKET CONTROL: The ability of buyers or sellers to exert influence over the price or quantity of a good, service, or commodity exchanged in a market. Market control depends on the number of competitors. If a market has relatively few buyers, but a bunch of sellers, then the buyers tend to have relatively more market control than sellers. The converse occurs if there are a bunch of buyers, but relatively few sellers. If the market is controlled on the supply side by one seller, we have a monopoly, and if it is controlled on the demand side by one buyer, we have a monopsony. Most markets are subject to some degree of control.

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PERFECT COMPETITION, EFFICIENCY

Perfect competition is an idealized market structure that achieves an efficient allocation of resources. This efficiency is achieved because the profit-maximizing quantity of output produced by a perfectly competitive firm results in the equality between price and marginal cost. In the short run, this involves the equality between price and short-run marginal cost. In the long run, this is seen with the equality between price and long-run marginal cost at the minimum efficient scale of production.

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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either a toaster oven that has convection cooking or a birthday gift for your mother. Be on the lookout for infected paper cuts.
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Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
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-- Simon Bolivar, South American liberator

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