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MARKET FAILURE: A condition in which a market does not efficiently allocate resources to achieve the greatest possible consumer satisfaction. The four main market failures are--(1) public good, (2) market control, (3) externality, and (4) imperfect information. In each case, a market acting without any government imposed direction, does not direct an efficient amount of our resources into the production, distribution, or consumption of the good.

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INCOME EFFECT

The change in quantity demanded that results because a change in the demand price of a good affects real income (that is, the purchasing power of income) even though nominal income remains the same. This is one of two reasons, or effects, underlying the law of demand and the negative slope of the market demand curve. The other is the substitution effect.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club hoping to buy either a Boston Red Sox baseball cap or a square lamp shade with frills along the bottom. Be on the lookout for telephone calls from former employers.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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