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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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MARKET EQUILIBRIUM

The state of equilibrium that exists when the opposing market forces of demand and supply achieve a balance with no inherent tendency for change. Once achieved, a market equilibrium persists unless or until it is disrupted by an outside force, especially the demand and supply determinants. A market equilibrium is indicated by equilibrium price and equilibrium quantity.

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Today, you are likely to spend a great deal of time flipping through the yellow pages wanting to buy either a large stuffed brown and white teddy bear or a replacement washer for your kitchen faucet. Be on the lookout for pencil sharpeners with an attitude.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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