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FOREIGN EXCHANGE: Any financial instrument that gives one country a claim on the currency of another country and which is used to make payments between countries. The most important type of foreign exchange is currency itself, that is, the currency of other countries. However foreign exchange also includes things like bank checks and "bills of exchange" (a sort of contract that's paid for with the currency of one nation that can be then traded for the currency of another country).
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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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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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"Anything's possible. You can be told you have a 90% chance or a 50% chance or a 1% chance, but you have to believe, and you have to fight. " -- Lance Armstrong, cyclist
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CME Chicago Mercantile Exchange
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