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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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SEVENTH RULE OF COMPLEXITY

The seventh of seven basic rules of the economy, stating that every action in the complex world has direct and often intended consequences combined with indirect and probably unintended effects.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for gnomes hiding in cypress trees.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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