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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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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either a cell phone case or a pair of designer sunglasses. Be on the lookout for letters from the Internal Revenue Service.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
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