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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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UNCERTAINTY

The observation and recognition that information, especially information about the future, is not known. While any number of events might occur in the future, uncertainty exists because which specific events will occur is unknown. A related concept is risk, which is assigning probabilities to potential future outcomes. Uncertainty is a central component in the economic study of information.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs seeking to buy either a flower arrangement in a coffee cup for your father or a how-to book on meeting people. Be on the lookout for vindictive digital clocks with revenge on their minds.
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