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PERFECT PRICE DISCRIMINATION: A form of price discrimination in which a seller charges the highest price that buyers are willing and able to pay for each quantity of output sold. This is also termed first-degree price discrimination because the seller is able to extract ALL consumer surplus from the buyers. This is one of three price discrimination degrees. The others are second-degree price discrimination and third-degree price discrimination.

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MARGINAL RETURNS

The change in the quantity of total product resulting from a unit change in a variable input, holding all other inputs fixed. Marginal returns is an older and more generic term for marginal product. While marginal product has largely replaced marginal returns in most discussions of short-run production, the phrase does persist in a few terms like the law of diminishing marginal returns.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time searching for a specialty store looking to buy either a wall poster commemorating last Friday (you know why) or a country wreathe. Be on the lookout for crowded shopping malls.
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The average length of a "business lunch" is about 36 minutes.
"The greater danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it."

-- Michelangelo Buonarroti, Painter and Sculptor

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Quarterly Journal of Economics
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