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MARGINAL PROPENSITY TO INVEST: The proportion of each additional dollar of national income that is used for investment expenditures. Or alternatively, this is the change in investment expenditures due to a change in national income. Abbreviated MPI, the marginal propensity to invest is the slope of the investment line used in the analysis of Keynesian economics. As such, it also plays a role in the slope of the aggregate expenditure line and the multiplier effect.

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ECONOMIC SCIENCE

The application of the scientific method to economic phenomena and topics related to the fundamental problem of scarcity. Economic science, also termed positive economics, is one of several social sciences that apply the scientific method to the study of human behavior.

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Today, you are likely to spend a great deal of time watching the shopping channel wanting to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for cardboard boxes.
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