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INJECTION LINE: A line used in the injection-leakage model representing the relation between non-consumption expenditures (that is, injections) and national income. The three injections are investment expenditures, government purchases, and exports. The foundation of the injection line is the investment line, which is then enhanced by adding government purchases and exports. The other part of the injection-leakage model is a line representing leakages. The intersection of the injection and leakage lines identifies equilibrium aggregate output, or Keynesian equilibrium.

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VARIABLE COST

In general, cost that changes with changes in the quantity of output produced. More specifically, variable cost is combined with the adjectives "total" and "average" to indicate the overall level of variable cost or the per unit variable cost. Variable cost depends on the amount produced. If there is no production, then there is no variable cost.

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Today, you are likely to spend a great deal of time wandering around the downtown area hoping to buy either a wall poster commemorating last Friday (you know why) or a country wreathe. Be on the lookout for defective microphones.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
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