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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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PRODUCTION TIME PERIODS

Alternative time periods used to differentiate between variable inputs and fixed inputs that are key to the analysis of short-run production and long-run production by a firm. The two primary time periods are short run and long run. Two secondary periods are very short run (market period) and very long run. Time periods are specified based on the number of inputs that are fixed or variable.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites hoping to buy either a 50-foot blue garden hose or a turbo-powered vacuum cleaner. Be on the lookout for jovial bank tellers.
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The average bank teller loses about $250 every year.
"In war, there is no second prize for the runner-up."

-- Omar Bradley, US Army general

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