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FIFTH RULE OF IMPERFECTION: The fifth of seven basic rules of the economy. It is the observation that the real world is not perfect. This means markets often fail to achieve efficiency because of several failings. This also means that government seldom enacts the policies needed to correct market failings. We are usually faced with the lesser of evils.

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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 wandering around the shopping mall wanting to buy either 500 feet of telephone cable or a package of 4 by 6 index cards, the ones with lines. Be on the lookout for the happiest person in the room.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"Every generation of Americans needs to know that freedom exists not in doing what we like, but in having the right to do what we ought. "

-- Pope John Paul II

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