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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.
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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 |
Recommended Citation:MARKET CONTROL, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: January 15, 2026].
AmosWEB Encyclonomic WEB*pedia:Additional information on this term can be found at: WEB*pedia: market control
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ASSUMPTIONS, KEYNESIAN ECONOMICS The macroeconomic study of Keynesian economics relies on three key assumptions--rigid prices, effective demand, and savings-investment determinants. First, rigid or inflexible prices prevent some markets from achieving equilibrium in the short run. Second, effective demand means that consumption expenditures are based on actual income, not full employment or equilibrium income. Lastly, important savings and investment determinants include income, expectations, and other influences beyond the interest rate. These three assumptions imply that the economy can achieve a short-run equilibrium at less than full-employment production.
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BLUE PLACIDOLA
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Today, you are likely to spend a great deal of time at the confiscated property police auction hoping to buy either a rechargeable battery for your cell phone or a T-shirt commemorating the 2000 Olympics. Be on the lookout for poorly written technical manuals.
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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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"My philosophy of life is that if we make up our mind what we are going to make of our lives, then work hard toward that goal, we never lose - somehow we win out." -- President Ronald Reagan
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PV
Present Value
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