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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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AGGREGATE DEMAND DECREASE, SHORT-RUN AGGREGATE MARKET

A shock to the short-run aggregate market caused by a decrease in aggregate demand, resulting in and illustrated by a leftward shift of the aggregate demand curve. A decrease in aggregate demand in the short-run aggregate market results in a decrease in the price level and a decrease in real production. The level of real production resulting from the shock can be greater or less than full-employment real production.

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Today, you are likely to spend a great deal of time flipping through the yellow pages wanting to buy either semi-gloss photo paper that works with your neighbor's printer or a birthday gift for your father that doesn't look like every other birthday gift for your father. Be on the lookout for vindictive digital clocks with revenge on their minds.
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Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
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A nth-order Autoregressive Process
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