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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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VERTICAL MERGER

The consolidation of two or more separately-owned businesses, that have an input-output relation, into a single firm. This is one of three types of mergers. The other two are horizontal merger--two competing firms in the same industry that sell the same products--and conglomerate merger--two firms in separate, unrelated industries.

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Today, you are likely to spend a great deal of time watching infomercials wanting to buy either handcrafted decorations to hang on your walls or throw pillows for your bed. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
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