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SEVEN RULES: Seven key economic principles underlying the study of economics and the operation of the economy. These seven rules are: first -- scarcity, second -- subjectivity, third -- inequality, fourth -- competition, fifth -- imperfection, sixth -- ignorance, and seventh -- complexity.

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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 browsing about a thrift store trying to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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A half gallon milk jug holds about $50 in pennies.
"Well done is better than well said. "

-- Benjamin Franklin, statesman, inventor

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