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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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IMPLICIT COLLUSION

Seemingly independent, but parallel, actions among competing firms (mostly oligopolistic firms) in an industry designed to control the market, raise the price, and otherwise act like a monopoly. Also termed tacit collusion, the distinguishing feature of implicit collusion is the lack of any explicit agreement. This is one of two types of collusion. The other is explicit or overt collusion, which involves an explicit agreement.

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GRAY SKITTERY
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Today, you are likely to spend a great deal of time at a flea market looking to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"Good humor is a tonic for mind and body. It is the best antidote for anxiety and depression. It is a business asset. It attracts and keeps friends. It lightens human burdens. It is the direct route to serenity and contentment."

-- Grenville Kleiser, Author

AVC
Average Variable Cost
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