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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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OUTPUT GAPS

Recessionary and inflationary gaps created by differences between equilibrium real production achieved by the short-run aggregate market and full-employment real production. A recessionary gap occurs if short-run equilibrium real production is less than full-employment real production. An inflationary gap results if short-run real equilibrium production is greater than full-employment real production.

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Today, you are likely to spend a great deal of time wandering around the downtown area looking to buy either a video game player or an AC adapter that won't fry your computer. Be on the lookout for cardboard boxes.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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