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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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DISPOSABLE INCOME

The total income that can be used by the household sector for either consumption expenditures or saving during a given period of time, usually one year. Disposable income (DI) is one of three measures of income reported in the National Income and Product Accounts maintained by the Bureau of Economic Analysis. The other two are national income (NI) and personal income (PI). Two related measures of production are gross domestic product (GDP) and net domestic product (NDP).

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or a wall poster commemorating the 2000 Olympics. Be on the lookout for slow moving vehicles with darkened windows.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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