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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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NATURAL UNEMPLOYMENT

The combination of frictional and structural unemployment that persists in an efficient, expanding economy when labor and resource markets are in equilibrium. Natural unemployment exists when the economy is at full employment, which for practical purposes is defined as the condition in which the quantity of resources demanded is equal to the quantity of resources supplied. Most important for policy purposes, natural employment exists with stable prices, that is, no inflation.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites hoping to buy either a coffee cup commemorating the 2000 Olympics or a birthday gift for your grandmother. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"God grants victory to perseverance. "

-- Simon Bolivar, South American liberator

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