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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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QUANTITY DEMANDED

The specific quantity of a good that buyers are willing and able to buy at a specific demand price. The key word is "specific." Quantity demanded and demand price form matched pairs--one quantity, one price. The combination of all price-quantity pairs is then what constitutes demand. The demand curve is a plot of the quantity demanded at each demand price.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either storage boxes for your computer software CDs or a set of tires. Be on the lookout for small children selling products door-to-door.
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Lombard Street is London's equivalent of New York's Wall Street.
"No task is a long one but the task on which one dare not start: It becomes a nightmare. "

-- Charles Baudelaire, poet-critic

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