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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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VERY LONG RUN, MICROECONOMICS

A production time period in which all inputs are variable, including those under control of the firm and those beyond the control of the firm. During the very long run, not only are the labor, capital, land, and entrepreneurship inputs variable, but so too are key production inputs such as government rules, technology, and social customs. This is one of four production time periods used in the study of microeconomics. The other three are short run, long run, and very short run.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites looking to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for fairy dust that tastes like salt.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
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