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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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UTILITY

The satisfaction of wants and needs obtained from the use or consumption of goods and services. The terms utility and satisfaction are, for the most part, used interchangeably in economics. The concept of utility is integral to utility analysis, consumer demand theory, and the microeconomic analysis of consumer behavior and market demand.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time driving to a factory outlet seeking to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for slow moving vehicles with darkened windows.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"I can't change the direction of the wind, but I can adjust my sails to always reach my destination."

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MSE
Mean Square Error
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