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COMMON-PROPERTY GOOD: A good that's difficult to keep nonpayers from consuming, but use of the good by one person prevents use by others. Examples include oceans, the atmosphere, many lakes and streams, and large tracts of wilderness area or public parks. The term "common property" aptly describes the situation here, it's commonly owned and thus everyone has access to it, but it can be easily used up or destroyed. Many of our pollution problems occur because common property becomes a convenient place to dump waste materials. For efficiency, government needs to take charge of common-property goods, private exchange through markets can't do the job.

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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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APLS

BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time flipping through mail order catalogs looking to buy either a rechargeable battery for your camera or a coffee cup commemorating the first day of spring. Be on the lookout for rusty deck screws.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
"The time to repair the roof is when the sun is shining."

-- John F. Kennedy, 35th U. S. president

WPO
Weakly Pareto Optimal
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