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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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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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WHITE GULLIBON
[What's This?]
Today, you are likely to spend a great deal of time touring the new suburban shopping complex hoping to buy either a genuine down-filled comforter or a 200-foot blue garden hose. Be on the lookout for door-to-door salesmen.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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"Divide each difficulty into as many parts as is feasible and necessary to resolve it." -- Rene Descartes
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SIB
Securities and Investment Board
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