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SALES TAX: A tax on retail sales. This is major source of revenue for many state and local governments. Because poorer people tend to spend a larger share of their income on stuff covered by sales taxes, it tends to be a regressive tax. To reduce this regressiveness, some state and local governments excluded items like food and medicine.

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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 at a flea market looking to buy either a genuine down-filled pillow or one of those "hang in there" kitty cat posters. Be on the lookout for strangers with large satchels of used undergarments.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Look at everything as though you were seeing it either for the first or last time. Then your time on earth will be filled with glory."

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