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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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MONOPOLISTIC COMPETITION, DEMAND

The demand curve for the output produced by a monopolistically competitive firm is relatively elastic. The firm can sell a wide range of output within a relatively narrow range of prices. As a price maker, the firm has some ability (not much, but some) to control price. The demand curve is negatively sloped, but relatively elastic, because each firm produces a slightly differentiated product, but faces competition from a large number of very, very close substitutes.

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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either an ink cartridge for your printer or a rechargeable battery for your camera. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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