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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.
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PLASTIC MONEY A slang phrase for credit cards, especially when such cards used to make purchases. The "plastic" portion of this term refers to the plastic construction of credit cards, as opposed to paper and metal of currency. The "money" portion is an erroneous reference to credit cards as a form of money, which they are not. Although credit cards do facilitate transactions, because they are a liability rather than an asset, they are not money and not part of the economy's money supply.
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GREEN LOGIGUIN
[What's This?]
Today, you are likely to spend a great deal of time touring the new suburban shopping complex looking to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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"Anyone who has never made a mistake has never tried anything new. " -- Albert Einstein, physicist
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SIPP
Survey of Income and Program Participation
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