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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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PRODUCTION INPUTS

The resources, or factors of production, used in the production of output by a firm. This term is most frequently associated with the analysis of short-run production, and is often modified by the terms fixed and variable, as in fixed input and variable input. The quantity of a variable input can be changed in the short run and the quantity of a fixed input cannot be changed.

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Today, you are likely to spend a great deal of time searching the newspaper want ads looking to buy either a 200-foot blue garden hose or a video camera with stop action features. Be on the lookout for small children selling products door-to-door.
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In the early 1900s around 300 automobile companies operated in the United States.
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