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RIVAL CONSUMPTION: Consumption of a good by one person imposes a cost on, or prevents consumption of the good by, another person. Some goods, like food, have extremely rival consumption. One person, and only one person, gets the benefit. Other goods, like national defense, have no consumption rivalry, everyone can benefit simultaneously without imposing a cost on others. This is one of the two key characteristics of a good (the other is excludability) that distinguishes between common-property goods, near-public goods, private goods, and public goods.

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MIDPOINT ELASTICITY FORMULA

A simple technique for calculating the coefficient of elasticity by estimating the average elasticity for discrete changes in two variables. The distinguishing characteristic of this formula is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than initial values. An alternative technique is the endpoint elasticity formula.

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Today, you are likely to spend a great deal of time lost in your local discount super center looking to buy either a weathervane with a chicken on top or a flower arrangement with daisies and carnations for your uncle. Be on the lookout for attractive cable television service repair people.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"My philosophy of life is that if we make up our mind what we are going to make of our lives, then work hard toward that goal, we never lose - somehow we win out."

-- President Ronald Reagan

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