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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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OLIGOPSONY

A market characterized by a small number of large buyers controlling the buying-side of a market. Oligopsony is the buying-side equivalent of a selling-side oligopoly. Much as a oligopoly is a market dominated by a few large sellers, oligopsony is a market dominated by a few large buyers. While oligopsony could be analyzed for any type of market it tends to be most relevant for factor markets in which a handful of firms control the buying of a factor. Two related buying side market structures are monopsony and monopsonistic competition.

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Today, you are likely to spend a great deal of time flipping through the yellow pages wanting to buy either semi-gloss photo paper that works with your neighbor's printer or a birthday gift for your father that doesn't look like every other birthday gift for your father. Be on the lookout for vindictive digital clocks with revenge on their minds.
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