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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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CONSUMER SURPLUS

The satisfaction that consumers obtain from a good over and above the price paid. This is the difference between the maximum demand price that buyers are willing to pay and the price that they actually pay. A related notion from the supply side of the market is producer surplus.

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