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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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COLLUSION, EFFICIENCY

Colluding oligopolistic firms generally produce less output and charge a higher price than would be the case for a perfectly competitive industry. The efficiency of colluding oligopolistic firms is essentially the same as that for monopoly. In essence, colluding oligopolistic firms function just as if the market is a monopoly. The price charged by the colluding firms is higher than the marginal cost of production and the quantity is less. Most notably, price is greater than marginal, a violation of the key condition for efficiency.

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YELLOW CHIPPEROON
[What's This?]

Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a country wreathe or galvanized steel storage shelves. Be on the lookout for cardboard boxes.
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This isn't me! What am I?

The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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Journal of Economic History
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