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ZERO-BASE BUDGET: A method of budgeting expenditures in which each expenditure is justified on its overall merits rather than being based on the budget for the previous year. A zero-base budget is most often proposed (but seldom implemented) for governments. Governments generally establish budget expenditures based on expenditures for the previous year. If, for example, budget expenditures last year were $100 billion, the requested budget for this year might be set at $110 billion. The existing $100 billion is a "given" and only the extra $10 billion is justified. With a zero-base budget, the entire $110 billion is justified.

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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.

     See also | elasticity | variable | point elasticity | midpoint formula |


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MARGINAL COST AND LAW OF DIMINISHING MARGINAL RETURNS

Decreasing then increasing marginal cost, reflected by a U-shaped marginal cost curve, is the result of increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of short-run production. This translates into a positively-sloped supply curve for profit-maximizing competitive firms.

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