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SAVING-INVESTMENT 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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SLOPE, INVESTMENT LINE

The positive slope of the investment line is also termed the marginal propensity to invest (MPI). This slope is greater than zero but less than one, reflecting induced investment. The slope of the investment line affects the slope of the aggregate expenditures line and thus also affects the magnitude of the multiplier process.

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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for door-to-door salesmen.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
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