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PLANNING CURVE: Another term for the long-run average cost curve (LRAC). Using the name planning curve indicates that the long-run average cost curve is used to "making plans" especially concerning the desired scale of operations of a firm. That is, in the long run a firm will seek the plant size that maximizes long-run profit by equating long-run marginal cost and marginal revenue. It will then pick out the appropriate plant size off the long-run average cost with the minimum short-run average total cost.

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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 wandering around the shopping mall seeking to buy either a 50 foot extension cord or a combination CD player, clock radio, and telephone (with answering machine). Be on the lookout for the last item on a shelf.
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John Maynard Keynes was born the same year Karl Marx died.
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