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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 REVENUE, PERFECT COMPETITION

The revenue received for selling a good per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue often goes by a simpler and more widely used term... price. For a perfectly competitive firm average revenue is also equal to marginal revenue. Average revenue for a perfectly competitive firm is often depicted by a horizontal average revenue curve.

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PURPLE SMARPHIN
[What's This?]

Today, you are likely to spend a great deal of time driving to a factory outlet seeking to buy either a coffee cup commemorating next Thursday or a replacement remote control for your stereo system. Be on the lookout for high interest rates.
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This isn't me! What am I?

Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"I can't change the direction of the wind, but I can adjust my sails to always reach my destination."

-- Jimmy Dean

NPV
Net Present Value
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