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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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PRINCIPLE

A generally accepted, verified, proven, fundamental law of nature. A principle captures a cause-and-effect relation about the workings of the world that has been tested and verified through the scientific method. The law of demand, law of increasing opportunity cost, and law of diminishing marginal utility are three fundamental (and extremely important) economic principles.

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Today, you are likely to spend a great deal of time at a flea market seeking to buy either a pleather CD case or a how-to book on fine dining. Be on the lookout for door-to-door salesmen.
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Sixty percent of big-firm executives said the cover letter is as important or more important than the resume itself when you're looking for a new job
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Constant Returns to Scale
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