Economic Definition of injection line. Defined.
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Term injection line Definition: 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.