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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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WHITE GULLIBON
[What's This?]

Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway seeking to buy either throw pillows for your living room sofa or a hepa filter for your furnace. Be on the lookout for door-to-door salesmen.
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This isn't me! What am I?

The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
"In war, there is no second prize for the runner-up."

-- Omar Bradley, US Army general

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