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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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PRODUCT LIFE CYCLE The different stages that a product traverses over the course of its life from initial availability (birth) to eventual unavailability (death). The key stages are development, introduction, growth, maturity, saturation, and decline. The product life cycle, represented by an S-shaped curve, is an adaptation of the biological life cycle and is common to the study of marketing. It is also important in the analysis of innovation and economic instability. In addition to biological growth, comparable S-shaped life cycles are found in short-run production of a firm, the growth of a person's income, the acquisition of knowledge, and the development of a civilization.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a weathervane with a chicken on top or a flower arrangement with daisies and carnations for your uncle. Be on the lookout for cardboard boxes.
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This isn't me! What am I?
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John Maynard Keynes was born the same year Karl Marx died.
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"There are no shortcuts to any place worth going. " -- Beverly Sills, Opera singer
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GDP
Gross Domestic Product
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