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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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NORMAL PROFIT

The opportunity cost of using entrepreneurial abilities in the production of a good, or the profit that could be received by entrepreneurship in another business venture. Like the opportunity costs of other resources, normal profit is deducted from revenue to determine economic profit. It is, however, never included as an accounting cost when accounting profit is computed.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers looking to buy either a rim for your spare tire or decorative celebrity figurines. Be on the lookout for fairy dust that tastes like salt.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"Man is born to live, not to prepare for life. "

-- Boris Pasternak, writer

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