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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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PERFECT COMPETITION, REVENUE DIVISION

The marginal approach to analyzing a perfectly competitive firm's short-run profit maximizing production decision can be used to identify the division of total revenue among variable cost, fixed cost, and economic profit. The U-shaped cost curves used in this analysis provide all of the information needed on the cost side of the firm's decision. The demand curve facing the firm (which is also the firm's average revenue and marginal revenue curves) provides all of the information needed on the revenue side.

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Today, you are likely to spend a great deal of time driving to a factory outlet looking to buy either storage boxes for your income tax returns or an AC adapter for your CD player. Be on the lookout for the happiest person in the room.
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In his older years, Andrew Carnegie seldom carried money because he was offended by its sight and touch.
"Always vote for principle, though you may vote alone, and you may cherish the sweetest reflection that your vote is never lost. "

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