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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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FULL-RESERVE BANKING

A (hypothetical) method of banking in which banks keep 100 percent of their deposits in the form of bank reserves, meaning there are no deposits available for interest-paying loans. Full-reserve banking is one of two theoretical alternatives designed to help illustrate a contrast to the fractional-reserve banking actually practiced by modern banks. The other alternative is no-reserve banking. With full-reserve a bank essentially operates as a storage business, merely storing customer deposits until they are withdrawn.

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