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PERFECT COMPETITION AND EFFICIENCY: Perfect competition is the idealized market structure that achieves an efficient allocation of resources. The conditions of perfect competition, including (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology, ensure that perfect competition efficiently allocates resources. This is in fact the purpose of perfect competition: a market structure that illustrates perfection, the best of all possible resource allocation worlds. The real world falls short of this perfection.

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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 largely depends on the number of competitors on each side of the market. If a market has relatively few buyers, but many sellers, then limited competition on the demand-side of the market means buyers tend to have relatively more market control than sellers. The converse occurs if a market has many buyers, but relatively few sellers. This is also termed market power.

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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either an ink cartridge for your printer or a rechargeable battery for your camera. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
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