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AD CURVE: The aggregate demand curve, which is a graphical representation of the relation between aggregate expenditures on real production and the price level, holding all ceteris paribus aggregate demand determinants constant. The aggregate demand, or AD, curve is one side of the graphical presentation of the aggregate market. The other side is occupied by the aggregate supply curve (which is actually two curves, the long-run aggregate supply curve and the short-run aggregate supply curve). The negative slope of the aggregate demand curve captures the inverse relation between aggregate expenditures on real production and the price level. This negative slope is attributable to the interest-rate effect, real-balance effect, and net-export effect.

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ABILITY-TO-PAY PRINCIPLE

A taxation principle stating that taxes should be based on the ability to pay taxes. The ability-to-pay principle works from the proposition that those who have the greatest income should pay the most taxes. The ability-to-pay principle is the only reasonable way to finance the provision of public goods such as national defense, public health, and environmental quality. This is one of two taxation principles. The other is the benefit principle, which states taxes should be based on the benefits received.

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Today, you are likely to spend a great deal of time at a flea market trying to buy either arch supports for your shoes or an AC adapter that works with your MPG player. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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In the early 1900s around 300 automobile companies operated in the United States.
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