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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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QUANTITY

The amount of a commodity (good, service, or resource) that is produced, consumed, bought, sold, or exchanged. The quantity of a commodity is often the focus of economic analysis. It takes center stage in the market model, as well as the theories of short-run production and consumer demand theory. In the standard market diagram, as well as most other analyses, quantity is displayed on the horizontal axis.

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Today, you are likely to spend a great deal of time wandering around the shopping mall seeking to buy either a genuine down-filled pillow or one of those "hang in there" kitty cat posters. Be on the lookout for small children selling products door-to-door.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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