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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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PLANNING HORIZON

Another term for the long-run average cost curve. The long-run average cost curve is termed the planning horizon or planning curve because it provides information that a firm can use to plan factory construction and expansion in the long run.

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Today, you are likely to spend a great deal of time watching the shopping channel trying to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for malfunctioning pocket calculators.
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In the early 1900s around 300 automobile companies operated in the United States.
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