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TIE-IN SALE: A type of sale in which consumers can buy one good only if they purchase another good as well. For example, if your grocery store sells you a bag of tea with the condition that you buy a pound of sugar, that would be a tie-in sale. Because they allow a monopoly to increase its profit over what it could make by selling the two goods separately at constant prices, tie-in sales can be used to price discriminate. However, it is important to realize that there are other reasons for tie-in sales other than price discrimination, such as to increase efficiency. For example, when we buy a car, it comes as a package of several goods (tires, engine, etc), which would be very difficult (and inefficient) for consumers to assemble if they were bought separately.

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LAW OF DIMINISHING MARGINAL RETURNS

A principle of short-run production stating that as a firm combines more of a variable input with a fixed input, the marginal product of the variable input eventually declines. This is THE economic principle underlying the analysis of short-run production for a firm. It offers an explanation for the law of supply and the positive slope of the market supply curve.

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BLUE PLACIDOLA
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Today, you are likely to spend a great deal of time at a garage sale trying to buy either a pair of gray heavy duty boot socks or a 50-foot blue garden hose. Be on the lookout for slightly overweight pizza delivery guys.
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John Maynard Keynes was born the same year Karl Marx died.
"Whenever you see a successful business, someone once made a courageous decision."

-- Peter F. Drucker, business strategist

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