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MARGINAL REVENUE CURVE, MONOPOLY: A curve that graphically represents the relation between marginal revenue received by a monopoly for selling its output and the quantity of output sold. The marginal revenue curve reflects the market control held by a monopoly firm. For a monopoly firm with complete market control, the marginal revenue curve is negatively-sloped. Moreover, for a given quantity of output, marginal cost is less than price, and the marginal revenue curve lies below the demand curve.

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INJECTIONS LINE

A graphical representation of the relation between the level of aggregate production and one or more injections. The three injections (non-consumption expenditures on aggregate production) are investment expenditures, government purchases and exports. The injections line sequentially adds, or layers, each of these three expenditures depending on the number of sectors used in the analysis (two, three, or four). The slope of the injections line depends on which if any of the expenditures are induced by aggregate production. The injections line is combined with the leakages line (containing saving, taxes, and imports) in the Keynesian injections-leakages model.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a birthday greeting card for your father or a T-shirt commemorating the first day of spring. Be on the lookout for letters from the Internal Revenue Service.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"A leader, once convinced that a particular course of action is the right one, must . . . be undaunted when the going gets tough."

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