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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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EFFICIENT

The state of resource allocation that exists when the highest level of consumer satisfaction is achieved from available resources. This state can be accomplished through markets when the price buyers are willing and able to pay for a good--based on the satisfaction obtained--is equal to the price sellers need to charge for a good--based on the opportunity cost of production.

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Today, you are likely to spend a great deal of time wandering around the downtown area wanting to buy either a pair of handcrafted oven mitts or a coffee table shaped like the state of Florida. Be on the lookout for cardboard boxes.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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