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PIGOUVIAN TAX: A tax on an external cost, such as pollution, designed to use market forces to achieve an efficient allocation of resources. A. C. Pigou, one of the first economists to study the market failure of externalities, is credited with developing this tax system for internalizing costs external to the market. An external cost caused by pollution, for example, can be internalized if polluters pay a tax equal to the value of the external cost.

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AGGREGATE DEMAND AND MARKET DEMAND

The aggregate demand curve, or AD curve, has similarities to, but differences from, the standard market demand curve. Both are negatively sloped. Both relate price and quantity. However, the market demand curve is negatively sloped because of the income and substitution effects and the aggregate demand curve is negatively sloped because of the real-balance, interest-rate, and net-export effects.

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APLS

YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors looking to buy either a handcrafted bird feeder or a New York Yankees baseball cap. Be on the lookout for slightly overweight pizza delivery guys.
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Two and a half gallons of oil are needed to produce one automobile tire.
"When you play, play hard; when you work, don't play at all. "

-- Theodore Roosevelt, 26th US president

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