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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

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FEDERAL RESERVE DEPOSITS

Deposits that commercial banks keep with the Federal Reserve System. Federal Reserve deposits play three key roles in the banking system. One, they are used by the Federal Reserve system to process or clear checks. Two, they are loaned between commercial banks through the Federal funds market. Three, they are used by the Federal Reserve System to control the money supply. Federal Reserve deposits are one of two types of bank assets that are considered bank reserves and used to satisfy reserve requirements. The other is vault cash.

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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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