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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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CARTEL

A formal agreement between businesses in the same industry, usually on an international scale, to gain market control, raise the market price, and otherwise act like a monopoly. The most famous international cartel is the Organization of Petroleum Exporting Countries (OPEC), which seeks to exert control over the world oil market. Other cartels have existed, or still exist, in the global markets for uranium, diamonds, long distance telephone services, and airlines.

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Today, you are likely to spend a great deal of time driving to a factory outlet wanting to buy either a half-dozen helium filled balloons or a packet of address labels large enough for addresses of both the sender and the recipient. Be on the lookout for pencil sharpeners with an attitude.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"Ships are safe in harbor. But that is not what ships are for."

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UTP
Unfair Trade Practice
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