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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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INVESTMENT, PRODUCTION POSSIBILITIES

Investment typically refers to the purchase of productive capital by business in anticipation of increasing production and (presumably) generating more profit. More generally, investment can be considered as sacrificing the current satisfaction of wants and needs (consumption goods) to expand productive capability (capital goods). Production possibilities analysis can be used to illustrate the tradeoff between consumption and capital as a movement along a production possibilities curve.

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Today, you are likely to spend a great deal of time at a dollar discount store wanting to buy either shoe laces for your snow boots or a rim for your spare tire. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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