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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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INJECTIONS

Non-consumption expenditures on aggregate production. The three aggregate expenditures grouped under the heading of injections are investment expenditures, government purchases and exports. Injections add to the core circular flow containing consumption, production, and income. The injections-leakages model is a Keynesian economics analysis that combines injections with leakages (saving, taxes, and imports) to identify the equilibrium level of aggregate production and income.

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Today, you are likely to spend a great deal of time wandering around the downtown area looking to buy either handcrafted decorations to hang on your walls or throw pillows for your bed. Be on the lookout for high interest rates.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
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