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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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CERTIFICATES OF DEPOSIT

Interest-paying bank accounts maintained by traditional commercial banks, credit unions, savings and loan associations, and mutual savings banks that stipulate a fixed interest rate and the length of maturity before the funds can be withdrawn. Certificates of deposit (CDs) pay a higher interest rate than regular savings accounts, but the funds cannot be withdraw at the full interest rate until the maturity date. These are one of two types of time deposits. The other is savings deposits. Certificates of deposit, along with savings deposits and other near monies, are added to M1 to derive M2.

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