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REALISM OF PERFECT COMPETITION: 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 a one or two of the four key characteristics of perfect competition, none matches all four sufficiently that we can declare a perfectly competitively industry. 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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ARC ELASTICITY The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.
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WHITE GULLIBON
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Today, you are likely to spend a great deal of time at a dollar discount store seeking to buy either a green and yellow striped sweater vest or a Boston Red Sox baseball cap. Be on the lookout for slow moving vehicles with darkened windows.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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"An organization's ability to learn, and translate that learning into action rapidly, is the ultimate competitive business advantage. " -- Jack Welch, General Electric chief executive
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IMF
International Monetary Found
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