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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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MARGINAL UTILITY CURVE

A curve illustrating the relation between the marginal utility obtained from consuming an additional unit of good and the quantity of the good consumed. The negative slope of the marginal utility curve reflects the law of diminishing marginal utility. The marginal utility curve also can be used to derived the demand curve.

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Today, you are likely to spend a great deal of time at a dollar discount store hoping to buy either a how-to book on fine dining or a coffee cup commemorating the first day of winter. Be on the lookout for letters from the Internal Revenue Service.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
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