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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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COMPETITIVE MARKET

A market with a large number of buyers and sellers, such that no single buyer or seller is able to influence the price or control any other aspect of the market. That is, none of the participants have significant market control. A competitive market achieves efficiency in the allocation of scarce resources if no other market failures are present.

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