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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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OTHER PRICES, SUPPLY DETERMINANT

The prices of other goods that influence the decision to sell a particular good, which are assumed constant when a supply curve is constructed. Other prices can be for goods that are either substitutes-in-production or complements-in-production. This is one of five supply determinants that shift the supply curve when they change. The other four are resource prices, production technology, sellers' expectations, and number of sellers.

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Today, you are likely to spend a great deal of time flipping through the yellow pages looking to buy either a rechargeable flashlight or storage boxes for your computer software CDs. Be on the lookout for infected paper cuts.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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