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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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COLLUSION PRODUCTION ANALYSIS

To avoid competition, oligopolistic firms are occasionally inclined to cooperate through collusion. Collusion occurs when two or more oligopolistic firms jointly agree to control market prices and quantity and to generally act like a monopoly. Colluding firms set a price and produce a quantity that maximizes industry-wide economic profit, the same price and quantity that would be selected by a profit-maximizing monopoly. Once the industry-wide price and production are determined, each individual firm produces the quantity of output that equates the marginal cost of the firm to the marginal revenue for the industry.

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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either a 50 foot extension cord or a combination CD player, clock radio, and telephone (with answering machine). Be on the lookout for rusty deck screws.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as long as we live."

-- Mortimer Adler

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