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COMPETITIVE MARKET: A market with a large number of buyers and a large number of sellers, such that no single buyer or seller is able to influence the price or any other aspect of the market -- no one has any market control. A competitive market achieves efficiency in the use of our scarce resources if there are no market failures present.

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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 seeking to buy either yellow cotton balls or a set of steel-belted radial snow tires. Be on the lookout for cardboard boxes.
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During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
"Expect people to be better than they are; it helps them to become better. But don't be disappointed when they're not; it helps them to keep trying."

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