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GIFFEN GOOD: A rare type of good seldom seen in the real world, in which a change in price causes quantity demanded to change in the same direction (in violation of the law of demand). In other words, an increase in the price of a Giffen good results in an increase in the quantity demanded. The existence of a Giffen good requires the existence of special circumstances. First, the good must be an inferior good. Second, the income effect triggered by a change in price must overwhelm the substitution effect. A Giffen good is most likely to result when the good is a significant share of the consumer's budget.
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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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GRAY SKITTERY
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Today, you are likely to spend a great deal of time at an auction seeking to buy either one of those "hang in there" kitty cat posters or a velvet painting of Elvis Presley. Be on the lookout for slightly overweight pizza delivery guys.
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In his older years, Andrew Carnegie seldom carried money because he was offended by its sight and touch.
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"Never let the fear of striking out get in your way. " -- Babe Ruth, baseball player
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Stock Exchange Automated Quotation System (UK)
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