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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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MARGINAL UTILITY AND DEMAND

An explanation of the law of demand and the negatively-sloped demand curve based on utility analysis and the law of diminishing marginal utility. The law of diminishing marginal utility states that marginal utility declines as consumption increases. Because demand price depends on the marginal utility obtained from a good, price also declines as consumption increases, meaning price and quantity demanded are inversely related, which is the law of demand.

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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time at a garage sale wanting to buy either a turbo-powered vacuum cleaner or a battery-powered, rechargeable vacuum cleaner. Be on the lookout for small children selling products door-to-door.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"Everyone is bound to bear patiently the results of his own example. "

-- Phaedrus, Philosopher

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