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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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VARIABLES

Quantities, usually represented as symbols, that can take on one of a set of values. A variable is "variable" because its value can "vary." A primary goal of economic analysis is to determine the specific value that a variable takes on under specific circumstances.

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Today, you are likely to spend a great deal of time lost in your local discount super center wanting to buy either handcrafted decorations to hang on your walls or throw pillows for your bed. Be on the lookout for cardboard boxes.
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During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
"Anything's possible. You can be told you have a 90% chance or a 50% chance or a 1% chance, but you have to believe, and you have to fight. "

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