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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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SEVENTH RULE OF COMPLEXITY The seventh of seven basic rules of the economy, stating that every action in the complex world has direct and often intended consequences combined with indirect and probably unintended effects.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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"The tragedy of life is not so much what men suffer, but rather what they miss. " -- Thomas Carlyle, Historian
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JLE
Journal of Law and Economics
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