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TANGENCY: A geometric condition that occurs when two curves touch at a single point with identical slopes at that point. This condition of tangency surfaces in several different areas of economic analysis, including indifference curve analysis (tangency between an indifference curve and budget line) and monopolistic competition (tangency between demand curve and long-run average cost curve). The tangency between two curves should be contrasted with the condition of intersection, in which two cross at a single point but do not have identical slopes.

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NONPAYER EXCLUDABILITY

Whether or not nonpayers can be excluded from consuming a good. In other words, can those who do not pay for a good be excluded from consuming the good. Nonpayer excludability is based on the ability to possess and transfer property rights or ownership of a good. For some goods, nonpayers can be easily excluded from consumption because property rights are well-defined and easily controlled. For other goods nonpayers cannot be easily excluded from consumption because property rights are not well-defined and cannot be easily controlled. When combined with consumption rivalry, the result is four alternative types of goods -- private, public, common-property, and near-public.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway looking to buy either several magazines on fashion design or a package of 3 by 5 index cards, the ones without lines. Be on the lookout for letters from the Internal Revenue Service.
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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.
"Perhaps the most valuable result of all education is the ability to make yourself do the thing you have to do, when it ought to be done, whether you like it or not; it is the first lesson that ought to be learned; and however early a man's training begins, it is probably the last lesson that he learns thoroughly. "

-- Thomas H. Huxley, Scientist

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