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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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PRODUCT MARKETS

Markets that exchange final goods and services, that is, the output that is combined into gross domestic product. The buyers of this production are the four macroeconomic sectors--household, business, government, and foreign. The seller of this production is primarily the business sector. A substantial part of macroeconomics is devoted to explaining how and why gross domestic product exchanged through product markets rises or falls. Product markets, also termed output or goods markets, are one of three primary sets of macroeconomic markets. The other two are resource markets and financial markets.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time at a crowded estate auction seeking to buy either a package of blank rewritable CDs or yellow cotton balls. Be on the lookout for slightly overweight pizza delivery guys.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
"Intense concentration hour after hour can bring out resources in people they didn't know they had. "

-- Edwin Land, inventor, entrepreneur

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