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TANSTAAFL: A rather cumbersome and usually hard to remember acronym for the expression "There ain't no such thing as a free lunch. This is a favorite saving of many economists because it highlights, albeit in a grammatically questionable manner, the fundamental problem of scarcity. The phrase serves to emphasize that seemingly "free" lunches are not really free. While they might be free to the customer, someone must pay, that is, incur an opportunity cost of foregone production. The lunch eaten by one person cannot be eaten by another.

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MARGINAL PHYSICAL PRODUCT

The change in the quantity of total physical product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal physical product, usually abbreviated MPP, is found by dividing the change in total physical product by the change in the variable input. Marginal physical product, which more often goes by the name marginal product (MP), is one of two measures derived from total physical product. The other is average physical product.

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YELLOW CHIPPEROON
[What's This?]

Today, you are likely to spend a great deal of time touring the new suburban shopping complex seeking to buy either hand lotion, a big bottle of hand lotion or a lighted magnifying glass. Be on the lookout for broken fingernail clippers.
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This isn't me! What am I?

The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
"He who truly knows has no occasion to shout. "

-- Leonardo da Vinci, painter, sculptor, architect, engineer

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