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April 26, 2018 

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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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TOTAL-MARGINAL RULE: A mathematical connection between a marginal value is the slope of a curve of the corresponding total value stating that the marginal IS the slope of the total curve. If the total curve has a positive slope (that is, is upward sloping), then marginal is positive. If the total product has a negative slope (downward sloping), then marginal is negative. If the total curve has a zero slope (horizontal), then marginal is zero. Moreover, if the total curve has an increasing slope (becoming steeper), then the marginal is rising. If the total curve has a decreasing slope (becoming flatter), then the marginal is falling.

     See also | slope | total product | total cost | total variable cost | marginal product | marginal cost | average-marginal rule |


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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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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either a remote controlled World War I bi-plane or a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for infected paper cuts.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"Sometimes when you innovate, you make mistakes. It is best to admit them quickly and get on with improving your other innovations. "

-- Steve Jobs, Apple Computer founder

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