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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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TOTAL VARIABLE COST AND TOTAL PRODUCT

Because variable cost is largely associated with the cost of employing at least one variable input in the short run, the total variable cost curve can be derived from the total product curve. This admittedly simplistic connection between total product and total variable cost is designed to illustrate the fundamental role that the law of diminishing marginal returns plays in the slope and shape of the total variable cost curve. Because he slope of the total variable cost curve, which is also the slope of the total cost curve, is marginal cost, this analysis also indicates how the law of diminishing marginal returns relates to marginal cost.

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