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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 going from convenience store to convenience store seeking to buy either a set of steel-belted radial snow tires or a wall poster commemorating the 2000 Presidential election. Be on the lookout for small children selling products door-to-door.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"You just don't luck into things as much as you'd like to think you do. You build step by step, whether it's friendships or opportunities. "

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