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PERFECTLY INELASTIC: An elasticity alternative in which changes in price do NOT cause any change in quantity. In other words, quantity is totally, completely unresponsive to price. Quantity just does not change, regardless of changes in price. Perfectly inelastic should be compared with other elasticity alternatives--perfectly elastic, relatively elastic, relatively inelastic, and unit elastic.

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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for telephone calls from long-lost relatives.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
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