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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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PERFECT COMPETITION, REALISM Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to one or two of the four key characteristics of perfect competition, none matches all four sufficiently that they can be declared PERFECTLY competitively. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius wanting to buy either a packet of address labels large enough for addresses of both the sender and the recipient or a key chain with a built-in flashlight and panic button. Be on the lookout for defective microphones.
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General Electric is the only stock from the original 1896 Dow Jones Industrial Average remaining in the current index.
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"Those who are blessed with the most talent don't necessarily outperform everyone else. It's the people with follow-through who excel. " -- Mary Kay Ash, May Kay Cosmetics founder
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ILO
International Labor Office
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