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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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KEYNESIAN EQUILIBRIUM

The state of macroeconomic equilibrium identified by the Keynesian model when the opposing forces of aggregate expenditures equal aggregate production achieve a balance with no inherent tendency for change. Once achieved, a Keynesian equilibrium persists unless or until it is disrupted by an outside force, especially changes in autonomous expenditures.

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Today, you are likely to spend a great deal of time at a going out of business sale looking to buy either 500 feet of telephone cable or a package of 4 by 6 index cards, the ones with lines. Be on the lookout for infected paper cuts.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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