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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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HORIZONTAL MERGER

The consolidation of two or more separately-owned businesses, operating in the same industry and producing competing products, into a single firm. This is one of three types of mergers. The other two are vertical merger--two firms in different stages of the production of one good--and conglomerate merger--two firms in separate, unrelated industries.

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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites wanting to buy either a how-to book on home repairs or a large, stuffed kitty cat. Be on the lookout for broken fingernail clippers.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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