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INSTITUTION: An established method or way of doing something that's widely accepted throughout society. Common institutions include marriage, markets, high school football in the fall, government, and Christmas gift-giving. Institutions provide the rules and guidelines needed to carry out the day-to-day activities of our lives. Institutions provide the crucial structure of a society and the framework within which economic activity takes place. Without institution structure, anarchy would prevail. With the rules, though, come rigidities that can prevent resources from being allocated efficiently.

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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club wanting to buy either a cross-cut paper shredder or a birthday greeting card for your father. Be on the lookout for telephone calls from long-lost relatives.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"A stumble may prevent a fall. "

-- Margaret Thatcher, British prime minister

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Weak Axiom of Profit Maximization
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