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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 FACTOR COST, PERFECT COMPETITION

The opportunity cost incurred by a perfectly competitive firm when using a given factor of production to produce a good or service. This is the total cost associated with the use of a particular resource or factor of production--it is the total cost of the factor. For a perfectly competitive firm, the price paid is constant and total factor cost increases at a constant rate. Total factor cost is predominately used in the analysis of the factor market. Two derivative factor cost measures are average factor cost and marginal factor cost.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway hoping to buy either a remote controlled World War I bi-plane or a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for deranged pelicans.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"As is our confidence, so is our capacity. "

-- William Hazlitt, essayist

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