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.

     See also | market power | monopoly | price | competitive market | price maker | price leadership | marginal-cost pricing | price-cost margin |

LERNER INDEX, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2019. [Accessed: January 21, 2019].

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A tax equity principle stating that people with a different ability to pay taxes should pay a different amount of taxes. This is one of two equity principles related to the ability-to-pay principle. The other is horizontal equity, which states that people with the same ability to pay taxes should pay the same amount of taxes.

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