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INJECTIONS-LEAKAGES MODEL: A model used in Keynesian economics based on the equality of non-consumption expenditures (or injections) and non-consumption uses of income (leakages). On one side of the equality is saving, taxes, and imports -- the non-consumption leakages. On the other side of the equality is investment, government purchases, and exports -- the non-consumption injections. The injection-leakage model provides an alternative to the Keynesian cross for identifying equilibrium aggregate output.

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Lesson 3: Scarcity | Unit 2: Resources Page: 5 of 17

Topic: Working Together <=PAGE BACK | PAGE NEXT=>

Here's how our four resources work together in the production process:
  • Land provides the basic raw materials that become the good.
  • Labor provides the human efforts that transform the materials into a good. They do the work.
  • Capital makes labor's production task easier and more effective. These are the tools.
  • Entrepreneurship undertakes the risk of beginning the whole production process and bringing the other three resources together.

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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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