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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.

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COMPETITIVE MARKET

A market with a large number of buyers and sellers, such that no single buyer or seller is able to influence the price or control any other aspect of the market. That is, none of the participants have significant market control. A competitive market achieves efficiency in the allocation of scarce resources if no other market failures are present.

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Today, you are likely to spend a great deal of time browsing about a thrift store wanting to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for telephone calls from former employers.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
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