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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 at a garage sale wanting to buy either a hepa filter for your furnace or a wall poster commemorating next Thursday. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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