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HORIZONTAL MERGER: The consolidation under a single ownership of two separately-owned businesses in the same industry. An example of a horizontal merger would be two soft drink companies merging to form a single firm. A horizontal merger should be contrasted with vertical merger--two firms in different stages of the production of one good, such that the output of one business is the input of the other; and conglomerate merger--two firms in totally, completely separate industries.

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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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Today, you are likely to spend a great deal of time at a flea market wanting to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for rusty deck screws.
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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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