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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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COMPLEMENT-IN-CONSUMPTION

One of two (or more) goods that provide satisfaction of a want or need when consumed together. A complement-in-consumption is one of two alternatives falling within the other prices determinant of demand. The other is a substitute-in-consumption. An increase in the price of one complement good causes a decrease in demand for the other. A complement-in-consumption has a negative cross elasticity of demand.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club looking to buy either a how-to book on home repairs or a large, stuffed kitty cat. Be on the lookout for defective microphones.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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