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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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SERVICE

Activities that provide direct satisfaction of wants and needs without the production of tangible products or goods. Like the related term good, a service is produced using society's resources and represents a fundamental aspect of the economy. Limited resources are used to produce the services that satisfy unlimited wants and needs in an ongoing effort to address the problem of scarcity.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either a large red and white striped beach towel or a bottle of blackcherry flavored spring water. Be on the lookout for defective microphones.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
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