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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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INVOLUNTARY EXCHANGE

The process of unwillingly trading one valuable commodity (good, service, or resource) for another, usually prompted by the coercive powers of government. The key term is "unwillingly," which distinguishes involuntary exchanges from voluntary exchanges, such as those that are the foundation of market transactions.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store wanting to buy either a remote controlled sports car with an air spoiler or semi-gloss photo paper that works with your neighbor's printer. Be on the lookout for malfunctioning pocket calculators.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
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