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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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RATIONAL ABSTENTION

The decision NOT to do something (such as vote in an election) because the cost of taking the action is more than the expected benefit. The rational decision to refrain from an endeavor is a straightforward application of utility maximization and along with the related notion of rational ignorance, is a source of voter apathy and government inefficiency.

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Today, you are likely to spend a great deal of time surfing the Internet seeking to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for deranged pelicans.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"I think luck is the sense to recognize an opportunity and the ability to take advantage of it . The man who can smile at his breaks and grabs his chance gets on."

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