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June 14, 2025 

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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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BARRIER TO ENTRY: An institutional, government, technological, or economic restriction on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

     See also | institution | government | technology | firm | market | market control | inefficiency | monopoly | monopsony | oligopsony | perfect competition | monopolistic competition | monopsonistic competition |


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MARKET DISEQUILIBRIUM

The state of the market that exists when the opposing market forces of demand and supply do achieve a balance and there is an inherent tendency for change. Market disequilibrium results if the market is not in equilibrium. More specifically, market disequilibrium results if the demand price is not equal to the supply price and the quantity demanded is not equal to the quantity supplied.

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