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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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DEPOSIT EXPANSION MULTIPLIER

The ratio of the change in checkable deposits to the change in reserves, which indicates the magnified change in deposits resulting from a change in reserves. The deposit expansion multiplier indicates how many checkable deposits are created with an injection of additional reserves into the banking system. As the name suggests, the change in checkable deposits is typically a multiple of the initial change in reserves. The size of the deposit expansion multiplier depends on the reserve requirement ratio. The deposit expansion multiplier also forms the core of the money multiplier.

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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
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