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ABILITY-TO-PAY PRINCIPLE: A principle of taxation in which taxes are based on the income or resource-ownership ability of people to pay the tax. The income tax collected by our friends at the Internal Revenue Service is one of the most common taxes that seeks to abide by the ability-to-pay principle. In theory, the income tax system is set up such that people with greater incomes pay more taxes. Proportional and progressive taxes follow this ability-to-pay principle, while regressive taxes, such as sales taxes and Social Security taxes, don't.

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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 at an auction seeking to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for deranged pelicans.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"You can't build a reputation on what you are going to do."

-- Henry Ford, automaker

BPEA
Brookings Papers on Economic Activity
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