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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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VOLUNTARY EXCHANGE

The process of willingly trading one valuable commodity (good, service, or resource) for another. The key term is "willingly," which distinguishes voluntary exchanges from involuntary exchanges, such as those created by government taxes. Voluntary exchanges are the foundation of market transactions.

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Today, you are likely to spend a great deal of time at a flea market seeking to buy either a wall poster commemorating the 2000 Presidential election or a rechargeable flashlight. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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