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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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INVESTMENT BUSINESS CYCLES

The notion that business cycles are caused by changes in business sector investment expenditures triggered by the natural ebb and flow of market conditions. This investment explanation of business-cycle instability rests on the proposition that the seeds of each subsequent business-cycle phase are planted during the current phase. An expansion creates the conditions that cause a contraction and a contraction creates the conditions that cause an expansion. This explanation suggests a critical role for government intervention and stabilization policies to correct the business-cycle problems of inflation and unemployment.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for pencil sharpeners with an attitude.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
"Habit is a cable; we weave a thread of it each day, and at last we cannot break it. "

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