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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is 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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ALLOCATIVE EFFICIENCY

Obtaining the most consumer satisfaction from available resources. In other words, resources are allocated in such a way that consumer satisfaction is at its highest possible level. This is also termed either efficiency or economic efficiency.

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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 birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for deranged pelicans.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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