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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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STABLE EQUILIBRIUM

Equilibrium that is restored if disrupted by an external force. Most economic models have equilibrium that is stable, reflecting the observation that the real world adapts to changes and maintains a fair degree of stability. The alternative to a stable equilibrium is an unstable equilibrium.

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Today, you are likely to spend a great deal of time looking for a downtown retail store seeking to buy either a really, really exciting, action-filled video game or a coffee cup commemorating the moon landing. Be on the lookout for letters from the Internal Revenue Service.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"The world is not dangerous because of those who do harm but because of those who look at it without doing anything. "

-- Albert Einstein, physicist

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