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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 strolling through a department store wanting to buy either a large, stuffed giraffe or a birthday greeting card for your aunt. Be on the lookout for malfunctioning pocket calculators.
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The average bank teller loses about $250 every year.
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