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HERFINDAHL 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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SECOND-DEGREE PRICE DISCRIMINATION

A form of price discrimination in which a seller charges different prices for different quantities of a good. This also goes by the name block pricing. Second-degree price discrimination is possible because decidedly different quantities are purchased by different types of buyers with different demand elasticities. This is one of three price discrimination degrees. The others are first-degree price discrimination and third-degree price discrimination.

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Today, you are likely to spend a great deal of time watching the shopping channel trying to buy either rechargeable batteries or a rechargeable battery for your computer. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
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