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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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INELASTIC SUPPLY

The general elasticity relation in which relatively large changes in price cause relatively small changes in quantity supplied. Large changes in price cause relatively small changes in quantity supplied or the percentage change in quantity supplied is smaller than the percentage change in price. This characterization of elasticity is most important for the price elasticity of supply. Inelastic supply is one of two general elasticity relations for supply. The other is elastic supply.

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