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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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AVERAGE FACTOR COST, PERFECT COMPETITION

Total factor cost per unit of factor input employed by a perfectly competitive firm in the production of output, found by dividing total factor cost by the quantity of factor input. Average factor cost, abbreviated AFC, is generally equal to the factor price. However, using the longer term average factor cost makes it easier to see the connection to related terms, including total factor cost and marginal factor cost.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either throw pillows for your living room sofa or a hepa filter for your furnace. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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In the early 1900s around 300 automobile companies operated in the United States.
"When one door closes another door opens; but we do often look so long and so regretfully upon the closed door, that we do not see the ones which open for us. "

-- Alexander Graham Bell, inventor

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