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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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FRACTIONAL-RESERVE BANKING

A method of banking activity in which banks keep less than 100 percent of their deposits in the form of bank reserves and use the rest for interest-paying loans. Fractional-reserve banking makes it possible for banks to function as profit-seeking financial intermediaries (matching up lenders and borrowers) while ensuring the safety and liquidity of deposits, especially checkable deposits that are part of the economy's money supply.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex wanting to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for cardboard boxes.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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