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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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VALUE IN EXCHANGE

The ability to trade an item or asset, especially money, for other goods and services that can then be used to satisfy wants and needs. Value in exchange means that value (that is, satisfaction) is obtained indirectly through the acquisition of something else. For an item to have value in exchange it need NOT have value in use, value obtained directly from the consumption of a good or service.

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Today, you are likely to spend a great deal of time searching for a specialty store wanting to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for telephone calls from former employers.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"Lord, where we are wrong, make us willing to change; where we are right, make us easy to live with. "

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