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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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OLIGOPOLY, REALISM

Real world markets are heavily populated by oligopoly. About half of all output produced in the U.S. economy each year is done so by oligopoly firms. Other industrialized nations can make a similar claim. Oligopoly markets arise in a wide assortment different industries, ranging from manufacturing to retail trade to resource extraction to financial services.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either an AC adapter that won't fry your computer or a case for your designer sunglasses. Be on the lookout for door-to-door salesmen.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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