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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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PRODUCER PRICE INDEX

An index of the prices domestic producers receive from selling their output. THE Producer Price Index (PPI) is actually one of several producer price indexes compiled and published monthly by the Bureau of Labor Statistics (BLS). Others track prices for different industries and goods. This is also one of several noted price indexes used to track economic activity. Others include the Consumer Price Index (CPI) and the GDP price deflator.

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