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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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ECONOMICS OF INFORMATION

The study of the role that information plays in the economy and in the allocation of resources, with special attention paid to efficient information search. Key topics in this area of study and analysis are asymmetric information, moral hazard, adverse selection, signalling, and screening. This study of the economics of information also provides insight into the analysis of risk and uncertainty, which are important to insurance and financial markets.

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Today, you are likely to spend a great deal of time wandering around the downtown area seeking to buy either storage boxes for your winter clothes or several magazines on time travel. Be on the lookout for crowded shopping malls.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"The only profit center is the customer. "

-- Peter Drucker, management consultant

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