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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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GEOGRAPHIC MOBILITY

The mobility, or movement, of factors of production from a productive activity in one location to a productive activity in another location. In particular, geographic mobility is the ease with which resources can change locations. This is one of two types of mobility. The other is occupational mobility.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a small, foam rubber football or an instructional DVD on learning to the play the oboe. Be on the lookout for telephone calls from former employers.
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Autoregressive Conditional Heteroskedasticity
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