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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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Lesson 20: Federal Reserve System | Unit 4: Monetary Policy Page: 12 of 20

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The Federal Reserve controls banks as a means of controlling the money supply.

A more specific definition:

Monetary policy is controlling the money creation activity of the fractional-reserve banking system to control deposits and the money supply to affect business-cycle fluctuations.

Early tasks of the Fed:

  • To keep banks in business and to avoid serious reductions in bank reserves that would shrink financial wealth and money supply.

    What the Fed does now:

  • Manipulate the money supply by manipulating reserves.

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MARGINAL COST AND MARGINAL PRODUCT

The U-shape of the marginal cost curve is closely related to the hump-shape of the marginal product curve. The increasing portion of the marginal product curve corresponds with the decreasing portion of the marginal cost curve. The decreasing portion of the marginal product curve corresponds with the increasing portion of the marginal cost curve. The peak of the marginal product curve corresponds with the minimum of the marginal cost curve.

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