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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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MARSHALLIAN CROSS

A diagram illustrating the market model, with price measured on the vertical axis and quantity measured on the horizontal axis, with the law of demand represented as a downward-sloping demand curve and the law of supply represented as an upward-sloping supply curve. The derivation of this name comes from the "Marshall" part of noted economist Alfred Marshall, and the intersection or "cross" of the demand and supply curves achieved at that market equilibrium.

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Today, you are likely to spend a great deal of time searching the newspaper want ads seeking to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for vindictive digital clocks with revenge on their minds.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"Lead the life that will make you kindly and friendly to everyone about you, and you will be surprised what a happy life you will lead."

-- Charles M. Schwab

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