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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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UNCERTAINTY

The observation and recognition that information, especially information about the future, is not known. While any number of events might occur in the future, uncertainty exists because which specific events will occur is unknown. A related concept is risk, which is assigning probabilities to potential future outcomes. Uncertainty is a central component in the economic study of information.

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Today, you are likely to spend a great deal of time at the confiscated property police auction hoping to buy either a computer that can play video games and burn DVDs or a black duffle bag with velcro closures. Be on the lookout for celebrities who speak directly to you through your television.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"The greatest things ever done on Earth have been done little by little. "

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