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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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Observations or measurements that quantify or otherwise identify some aspect of the real world. Data are used to track economic performance, quantify economic characteristics, and test economic hypotheses. Data collection is often the most challenging part of undertaking an empirical analysis.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store wanting to buy either a genuine fake plastic Tiffany lamp or a microwave over that won't burn your popcorn. Be on the lookout for letters from the Internal Revenue Service.
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During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
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