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February 19, 2026 

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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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AVERAGE REVENUE CURVE, MONOPOLISTIC COMPETITION

A curve that graphically represents the relation between average revenue received by a monopolistically competitive firm for selling its output and the quantity of output sold. Because average revenue is essentially the price of a good, the average revenue curve is also the demand curve for a monopolistically competitive firm's output.

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APLS

WHITE GULLIBON
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Today, you are likely to spend a great deal of time wandering around the downtown area trying to buy either an ink cartridge for your printer or a rechargeable battery for your camera. Be on the lookout for strangers with large satchels of used undergarments.
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A half gallon milk jug holds about $50 in pennies.
"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."

-- Albert Einstein

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