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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is 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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PERFECT COMPETITION, FACTOR MARKET ANALYSIS

The analysis of a factor market characterized by perfect competition indicates that each buyer maximizes profit by equating marginal revenue product to the factor price. This achieves an efficient allocation of resources and provides a benchmark for analyzing other factor market structures, including monopsony, monopoly, and bilateral monopoly.

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Today, you are likely to spend a great deal of time at an auction hoping to buy either a flower arrangement in a coffee cup for your father or a how-to book on meeting people. Be on the lookout for celebrities who speak directly to you through your television.
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A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
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