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S-I MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment, I) and leakages (saving, S) for the two basic sectors (household and business). Equilibrium is achieved at the intersection of the saving line, S, and the investment line, I.

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INCREASING MARGINAL RETURNS

In the short-run production by a firm, an increase in the variable input results in an increase in the marginal product of the variable input. Increasing marginal returns typically surface when the first few quantities of a variable input are added to a fixed input. This is one of two alternatives for marginal returns. The other is decreasing marginal returns. A related phenomenon for long-run production is increasing returns to scale.

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Today, you are likely to spend a great deal of time watching the shopping channel hoping to buy either a small palm tree that will fit on your coffee table or several magazines on fashion design. Be on the lookout for small children selling products door-to-door.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
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