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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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PRODUCTION COST

The opportunity cost of using labor, capital, land, and entrepreneurship in the production of goods and services. The price received by a seller must be high enough to cover production cost. The law of supply is based on the proposition that production cost increases with an increase in the quantity produced and supplied.

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