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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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ELASTICITY ALTERNATIVES, DEMAND

Five categories of the price elasticity of demand that reflect the entire range of the relative responsiveness of a change in quantity demanded to a change in price. These five alternatives--perfectly elastic, relatively elastic, unit elastic, relatively inelastic, and perfectly inelastic--are often illustrated by different demand curves. The price elasticity of supply is also reflected by five comparable alternatives.

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Today, you are likely to spend a great deal of time searching for a specialty store looking to buy either a flower arrangement in a coffee cup for your father or a how-to book on meeting people. Be on the lookout for small children selling products door-to-door.
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A half gallon milk jug holds about $50 in pennies.
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