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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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RELATIVELY INELASTIC

An elasticity alternative in which relatively large changes in one variable (usually price) cause relatively small changes in another variable (usually quantity). In other words, quantity is not very responsive to price. Quantity does change, but not much, in response to large changes in price. This characterization of elasticity is most important for the price elasticity of demand and the price elasticity of supply. Relatively inelastic is one of five elasticity alternatives. The other four are perfectly elastic, perfectly inelastic, relatively elastic, and unit elastic.

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