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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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FIRST-DEGREE PRICE DISCRIMINATION

A form of price discrimination in which a seller charges the highest price that buyers are willing and able to pay for each quantity of output sold. This is also termed perfect price discrimination because the seller is able to extract ALL consumer surplus from the buyers. This is one of three price discrimination degrees. The others are second-degree price discrimination and third-degree price discrimination.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers hoping to buy either 500 feet of coaxial cable or a coffee cup commemorating the 1960 Presidential election. Be on the lookout for telephone calls from long-lost relatives.
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It's estimated that the U.S. economy has about $20 million of counterfeit currency in circulation, less than 0.001 perecent of the total legal currency.
"A stumble may prevent a fall. "

-- Margaret Thatcher, British prime minister

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