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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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EXPANSION

A phase of the business cycle characterized by a general period of rising economic activity. An expansion is one of two basic business cycle phases. The other is contraction. The transition from expansion to contraction is termed a peak and the transition from contraction to expansion is termed a trough. The early phase of an expansion is commonly termed a recovery.

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Today, you are likely to spend a great deal of time watching infomercials hoping to buy either a computer that can play video games and burn DVDs or a black duffle bag with velcro closures. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
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