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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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SECOND RULE OF SUBJECTIVITY

The second of seven basic rules of the economy, stating that market prices are determined by subjective values and the preferences of buyers and resource owners. Contrary to popular opinion, prices and costs are not immutably facts of nature, but are ultimately based on what people are willing to pay or accept.

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