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DIAMOND-WATER PARADOX: The perplexing observation that water, which is more useful than diamonds, has a lower price. If price is related to utility, how can this occur? This paradox was first proposed by classical economists in the 19th century and was subsequently used as a stepping stone for developing the notion of marginal utility and the role it plays in the demand price of a good. The paradox is magically cleared up with an understanding of marginal utility and total utility. People are willing to pay a higher price for goods with greater marginal utility. As such, water which is plentiful has enormous total utility, but a low price because of a low marginal utility. Diamonds, however, have less total utility because they are less plentiful, but a high price because of a high marginal utility.

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VARIABLES

Quantities, usually represented as symbols, that can take on one of a set of values. A variable is "variable" because its value can "vary." A primary goal of economic analysis is to determine the specific value that a variable takes on under specific circumstances.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers looking to buy either a large, stuffed kitty cat or a cross-cut paper shredder. Be on the lookout for crowded shopping malls.
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The average bank teller loses about $250 every year.
"When you play, play hard; when you work, don't play at all. "

-- Theodore Roosevelt, 26th US president

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Chicago Mercantile Exchange
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