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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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PRICE CEILING

A legally established maximum price that is imposed on a market BELOW the price that otherwise would be achieved in equilibrium. A price ceiling is placed on a market with the goal of keeping the price low, presumably based on the notion that the equilibrium price is too high. If imposed on a competitive market free of market failures, a price ceiling creates a shortage, or excess demand.

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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Natural gas has no odor. The smell is added artificially so that leaks can be detected.
"Wherever you go, no matter what the weather, always bring your own sunshine."

-- Anthony J. D'Angelo

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Journal of Political Economy
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