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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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M1

The narrow-range monetary aggregate for the U.S. economy containing the combination of currency (and coins) issued by government and held by the nonbank public and checkable deposits issued by banking institutions. M1 contains the two items that function as THE medium of exchange for the U.S. economy. M1 is one of three monetary aggregates tracked and reported by the Federal Reserve System. The other two are designated M2 and M3.

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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either several magazines on fashion design or a package of 3 by 5 index cards, the ones without lines. Be on the lookout for jovial bank tellers.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"Most of the things worth doing in the world had been declared impossible before they were done."

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MR
Marginal Revenue
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