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July 26, 2024 

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MARGINAL REVENUE CURVE, MONOPOLISTIC COMPETITION: A curve that graphically represents the relation between marginal revenue received by a monopolistically competitive firm for selling its output and the quantity of output sold. The marginal revenue curve reflects the degree of market control held by a firm. For a monopolistically competitive firm with some market control, but not a whole lot, the marginal revenue curve is negatively-sloped but relatively elastic.

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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.

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


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INFLEXIBLE PRICES

The proposition that some prices adjust slowly in response to market shortages or surpluses. This condition is most important for macroeconomic activity in the short run and short-run aggregate market analysis. In particular, inflexible prices (also termed rigid prices or sticky prices) are a key reason underlying the positive slope of the short-run aggregate supply curve. Prices tend to be the most inflexible in resource markets, especially labor markets, and the least inflexible in financial markets, with product markets falling between the two.

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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
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