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OLIGOPOLY CHARACTERISTICS: The three most important characteristics of oligopoly are: (1) an industry dominated by a small number of large firms, (2) firms sell either identical or differentiated products, and (3) the industry has significant barriers to entry.

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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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APLS

RED AGGRESSERINE
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers seeking to buy either a small palm tree that will fit on your coffee table or several magazines on fashion design. Be on the lookout for poorly written technical manuals.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"Never let the fear of striking out get in your way. "

-- Babe Ruth, baseball player

NORC
National Opinion Research Center
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