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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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A generally accepted, verified, proven, fundamental scientific relation. A law is a scientifically certified, thoroughly verified, cause-and-effect relation about the workings of the world. It has been tested and retested through the scientific method. The law of demand, law of increasing opportunity cost, and law of diminishing marginal utility are three fundamental (and extremely important) economic laws of nature.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway hoping to buy either a combination CD player, clock radio, and telephone (with answering machine) or a revolving spice rack. Be on the lookout for strangers with large satchels of used undergarments.
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