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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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SLOPE, PRODUCTION POSSIBILITIES CURVE

The numerical value of the slope of the production possibilities curve, which illustrates the alternative combinations of two goods that an economy can produce with given resources and technology, is the opportunity cost of producing the good measured on the horizontal axis.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors seeking to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for strangers with large satchels of used undergarments.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
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