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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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REDUNDANT INFORMATION

Information received by the five senses (sight, sound, taste, touch, and smell) that is old, familiar, and usual. Because redundant information is not presumed to be threatening it can be largely ignored by the automatic response that is commonly termed the "fight or flight" reaction. The alternative is novel information, which is unfamiliar and potentially threatening.

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Today, you are likely to spend a great deal of time at a garage sale looking to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for crowded shopping malls.
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John Maynard Keynes was born the same year Karl Marx died.
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