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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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PERFECT COMPETITION, PROFIT ANALYSIS

A perfectly competitive firm produces the profit-maximizing quantity of output that generates the highest level of profit. This profit approach is one of three methods that used to determine the profit-maximizing quantity of output. The other two methods involve a comparison of total revenue and total cost or a comparison of marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for a thesaurus filled with typos.
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John Maynard Keynes was born the same year Karl Marx died.
"The past cannot be changed. The future is yet in your power. "

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