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INDUSTRY: A collection of firms that produce similar products sold in the same market. The concept of industry is most often used synonymously with market in most microeconomic analysis. That is, the study of perfect competition or oligopoly is not only the study of market structures, but also the study of industrial structure.

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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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Today, you are likely to spend a great deal of time at a going out of business sale wanting to buy either an electric coffee pot with automatic shutoff or a brown leather attache case. Be on the lookout for malfunctioning pocket calculators.
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Rosemary, long associated with remembrance, was worn as wreaths by students in ancient Greece during exams.
"A leader is most successful when people barely know he exists. When his work is done, his aim fulfilled, his troops will feel they did it themselves. "

-- Lao-Tzu, philosopher

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