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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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MOBILITY

The movement of factors of production from one productive activity to another. In particular, mobility is the ease with which resources can change production activities. Mobility generally takes one of two forms--geographic mobility (movement from place to place) and occupational mobility (movement from job to job). Mobility is a key determinant of factor supply.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a small, foam rubber football or an instructional DVD on learning to the play the oboe. Be on the lookout for telephone calls from former employers.
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More money is spent on gardening than on any other hobby.
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