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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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AVERAGE PRODUCT

The quantity of total output produced per unit of a variable input, holding all other inputs fixed. Average product, usually abbreviated AP, is found by dividing total product by the quantity of the variable input. Average product, which occasionally goes by the alias average physical product (APP), is one of two measures derived from total product. The other is marginal product.

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