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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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AGGREGATE DEMAND DETERMINANTS

An assortment of ceteris paribus factors other than the price level that affect aggregate demand, but which are assumed constant when the aggregate demand curve is constructed. Changes in any of the aggregate demand determinants cause the aggregate demand curve to shift. The specific ceteris paribus factors are commonly grouped by the four, broad expenditure categories--consumption expenditures, investment expenditures, government purchases, and net exports.

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Today, you are likely to spend a great deal of time at a garage sale trying to buy either a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or a wall poster commemorating the 2000 Olympics. Be on the lookout for door-to-door salesmen.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
"Opportunities are usually disguised as hard work, so most people don't recognize them."

-- Ann Landers, columnist

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