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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-CLEARING PRICE

The price that exists when a market is clear of shortage and surplus, or is in equilibrium. Market-clearing price is a common, non-technical term for equilibrium price. In a market graph, the market-clearing price is found at the intersection of the demand curve and the supply curve.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a green and yellow striped sweater vest or a Boston Red Sox baseball cap. Be on the lookout for strangers with large satchels of used undergarments.
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Two and a half gallons of oil are needed to produce one automobile tire.
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