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REGULATION: Government rules or laws that control the activities of businesses and consumers. The motivation for regulation is that businesses are inclined to do things that are harmful to the public--actions which need to be prevented or otherwise controlled. Regulation is essentially an extension of government's authority to protect one member of society from another. It tends to take one of two forms--(1) industry regulation that's intended to prevent firms from gaining and abusing excessive market control and (2) social regulation that seeks to protect consumers for problems caused by pollution, unsafe products, and the lack of information (market failure).

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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 strolling through a department store hoping to buy either a handcrafted spice rack or a cell phone case. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"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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