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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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L

A broad monetary measure that combines M3 plus several liquid assets, including commercial paper, U.S. Treasury bills, savings bonds, and bankers' acceptances. L used to be tracked and reported by the Federal Reserve System along with M1, M2, and M3. However, L is no longer reported.

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Today, you are likely to spend a great deal of time lost in your local discount super center trying to buy either a set of luggage without wheels or a how-to book on wine tasting. Be on the lookout for fairy dust that tastes like salt.
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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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