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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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MARGINAL FACTOR COST, MONOPSONY

The change in total factor cost resulting from a change in the quantity of factor input employed by a monopsony. Marginal factor cost, abbreviated MFC, indicates how total factor cost changes with the employment of one more input. It is found by dividing the change in total factor cost by the change in the quantity of input used. Marginal factor cost is compared with marginal revenue product to identify the profit-maximizing quantity of input to hire.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors looking to buy either a T-shirt commemorating the 2000 Olympics or a genuine fake plastic Tiffany lamp. Be on the lookout for letters from the Internal Revenue Service.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Luck is what happens when preparation meets opportunity. "

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ARMA
Autoregressive Moving Average
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