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POLLUTION TYPES: Pollution residuals fall into one of three categories--degradable, nondegradeable, and persistent. Damage done by each type, and thus external cost, typically varies. At one extreme are degradable residuals and at the other are nondegradable. In the middle are persistent residuals.

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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 lost in your local discount super center seeking to buy either a square lamp shade with frills along the bottom or an electric coffee pot with automatic shutoff. Be on the lookout for rusty deck screws.
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Lombard Street is London's equivalent of New York's Wall Street.
"Nothing ever built arose to touch the skies unless some man dreamed that it should, some man believed that it could, and some man willed that it must. "

-- Charles Kettering, inventor

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