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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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NORMATIVE ECONOMICS

The branch of economics that seeks to recommend the way the economy should operate. It is the policy side of economics that is based on individual preferences and cannot be proven either right or wrong. A normative economic statement cannot be refuted by looking at the real world--that is, by testing hypotheses.

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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius looking to buy either clothing for your pet iguana or a set of hubcaps. Be on the lookout for small children selling products door-to-door.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
"Never let the fear of striking out get in your way. "

-- Babe Ruth

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