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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

The willingness and ability to buy a range of quantities of a good at a range of prices, during a given time period. Demand is an inverse relation between price (demand price) and quantity (quantity demanded). Demand is one half of the market exchange process--the other is supply. This demand side of the market draws inspiration from the unlimited wants and needs dimension of the scarcity problem.

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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a tall storage cabinet with five shelves and a secure lock or a birthday greeting card for your grandmother. Be on the lookout for poorly written technical manuals.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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