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MATERIALS BALANCE: A hard and fast rule that the total amount of stuff removed from the natural environment will be eventually returned, probably as pollution. This is based on a fundamental law of physics that says material can be neither created nor destroyed, but only transformed. During any given period (such as a year) the quantity of materials returned to the environment is the difference between the quantity extracted and the quantity used by the economy.

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MARGINAL REVENUE PRODUCT

The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input or by multiplying marginal physical product by marginal revenue. This is also termed value of the marginal product. Marginal revenue product is a key concept for understanding the demand for productive inputs.

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Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either a flower arrangement in a coffee cup for your father or a how-to book on meeting people. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Lombard Street is London's equivalent of New York's Wall Street.
"The man who can drive himself further once the effort gets painful is the man who will win. "

-- Roger Bannister, runner

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