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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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LAW OF INCREASING OPPORTUNITY COST

The proposition that opportunity cost, the value of foregone production, increases as the quantity of a good produced increases. This fundamental economic principles can be seen in the production possibilities schedule and is illustrated graphically through the slope of the production possibilities curve. It generates a distinctive convex shape, flat at the top and steep at the bottom.

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Today, you are likely to spend a great deal of time surfing the Internet hoping to buy either a birthday gift for your uncle or a pair of red and purple designer socks. Be on the lookout for slow moving vehicles with darkened windows.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
"Don't waste your effort on a thing that results in a petty triumph unless you are satisfied with a life of petty issues. "

-- John D. Rockefeller, industrialist

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