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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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INCOME EFFECT

The change in quantity demanded that results because a change in the demand price of a good affects real income (that is, the purchasing power of income) even though nominal income remains the same. This is one of two reasons, or effects, underlying the law of demand and the negative slope of the market demand curve. The other is the substitution effect.

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