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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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DEMAND-DRIVEN BUSINESS CYCLES

Business-cycle instability caused by changes in one or more of the four aggregate demand expenditures on gross domestic production--consumption expenditures, investment expenditures, government purchases, and net exports. This is one of two basic types of business cycles--the other being supply-driven business cycles. Demand-driven business cycles tend to be the more common of the two types.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a birthday greeting card for your aunt or a wall poster commemorating the moon landing. Be on the lookout for defective microphones.
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Rosemary, long associated with remembrance, was worn as wreaths by students in ancient Greece during exams.
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