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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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AVERAGE FACTOR COST CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between average factor cost incurred by a perfectly competitive firm for employing an input and the quantity of input used. Because average factor cost is essentially the price of the input, the average factor cost curve is also the supply curve for the input. The average factor cost curve for a perfectly competitive firm with no market control is horizontal. The average revenue curve for a firm with market control is positively sloped.

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Today, you are likely to spend a great deal of time searching the newspaper want ads seeking to buy either a coffee cup commemorating the 1960 Presidential election or a how-to book on fixing your computer, with illustrations. Be on the lookout for fairy dust that tastes like salt.
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The first paper notes printed in the United States were in denominations of 1 cent, 5 cents, 25 cents, and 50 cents.
"The difference between the impossible and the possible lies in a person's determination. "

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