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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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ECONOMIC THINKING

A way of looking at and analyzing the way the world works by comparing the cost of an action with the benefit generated. The study of economics is the process of economic thinking about issues related to the scarcity problem.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway trying to buy either a birthday greeting card for your father or a T-shirt commemorating the first day of spring. Be on the lookout for poorly written technical manuals.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
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