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MARKET STRUCTURE: The manner in which a market is organized, based largely on the number of firms in the industry. The four basic market structure models are: perfect competition, monopoly, monopolistic competition, and oligopoly. The primary difference between each is the number of firms on the supply side of a market. Both perfect competition and monopolistic competition have a large number of relatively small firms selling output. Oligopoly has a small number of relatively large firms. And monopoly has a single firm.

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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.

     See also | market | price | market structure | monopoly | monopsony | competitive market | fourth rule of competition | price taker | price maker | competitive market |


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MARKET CONTROL, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: October 9, 2026].


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MARKET FOR LEMONS

A market adversely selects only lower quality products for exchange. The market for lemons is an illustration of adverse selection that results from asymmetric information. In this market, because buyers have limited information they offer an average price based on the average quality of the goods. Sellers, however, with better information select to sell lower quality products but not higher quality ones. Two methods of address this problem are signalling and screening. Two related information problems are moral hazard and the principal-agent problem.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers seeking to buy either a genuine down-filled snow parka or throw pillows for your living room sofa. Be on the lookout for door-to-door salesmen.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
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