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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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FACTOR DEMAND

The willingness and ability of productive activities (usually, business firms) to hire or employ factors of production. Factor demand relates factor price and factor quantity, specifically, it is the range of factor quantities that are demanded at a range of factor prices. This is one half of the factor market. The other half is factor supply. The factors of production subject to factor demand include any and all of the four scarce resources--labor, capital, land, and entrepreneurship. However, because labor involves human beings directly, it is the factor that tends to receive the most scrutiny and analysis.

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Today, you are likely to spend a great deal of time at the confiscated property police auction trying to buy either a Boston Red Sox baseball cap or a square lamp shade with frills along the bottom. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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