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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 CURVE

A curve illustrating the relation between the marginal utility obtained from consuming an additional unit of good and the quantity of the good consumed. The negative slope of the marginal utility curve reflects the law of diminishing marginal utility. The marginal utility curve also can be used to derived the demand curve.

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Today, you are likely to spend a great deal of time strolling through a department store wanting to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for a thesaurus filled with typos.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"How wonderful it is that nobody need wait a single moment before starting to improve the world."

-- Anne Frank

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