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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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ECONOMIC SYSTEM

The assorted institutions that society uses to answer the three basic questions of allocation and address the fundamental problem of scarcity. Another, more popular term for economic system is economy. An economy, or economic system, is the structural framework in which households, businesses, and governments undertake the production and consumption decisions that allocate limited resources to satisfy unlimited wants and needs.

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Today, you are likely to spend a great deal of time wandering around the downtown area trying to buy either galvanized steel storage shelves or a large green chalkboard shaped like the state of Maine. Be on the lookout for neighborhood pets, especially belligerent parrots.
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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.
"If I have ever made any valuable discoveries, it has been owing more to patient attention than to any other talent. "

-- Isaac Newton, mathematician, physicist

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