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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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RISK PREMIUM

The difference between a guaranteed or certain income and a risky income that generate the same level of utility. Risk premium is the amount of income that a risk adverse person is willing to pay to avoid the risk. Alternatively, it is the amount of income that a risk loving person is willing to pay to engage in risk. For risk aversion, the risk premium is the amount a person would pay for insurance.

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