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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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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either several magazines on computer software or a T-shirt commemorating the second moon landing. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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Junk bonds are so called because they have a better than 50% chance of default, carrying a Standard & Poor's rating of CC or lower.
"My future starts when I wake up every morning . . . Every day I find something creative to do with my life. "

-- Miles Davis, musician

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