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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 DEMAND

The combined demand of everyone willing and able to buy a good in a market. Market demand is one half of the market. The other is market supply. It is graphically represented by a negatively-sloped market demand curve, which can be derived by combining, or adding, the individual demands of every buyer in the market.

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Today, you are likely to spend a great deal of time watching the shopping channel seeking to buy either a computer that can play music and burn CDs or a T-shirt commemorating last Friday (you know why). Be on the lookout for rusty deck screws.
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It's estimated that the U.S. economy has about $20 million of counterfeit currency in circulation, less than 0.001 perecent of the total legal currency.
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