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SCIENCE: A discipline, or topic of study, that uses the scientific method to investigate and explain the operation of the world by testing and verifying hypothesized relationships. While the term science is often used in reference to the physical sciences, including chemistry, physics, and biology, it's also relevant to social sciences, including economics, sociology, and political science. The reason is that science is not really a subject, but a method of investigation--the scientific method. The scientific method is uses theories to derived hypotheses which are verified against real world data.

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MARGINAL PROPENSITY TO INVEST

The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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Today, you are likely to spend a great deal of time strolling through a department store trying to buy either a genuine down-filled snow parka or throw pillows for your living room sofa. Be on the lookout for the happiest person in the room.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
"It's usually the last ounce of effort that tips the scales of success."

-- Rick Beneteau

GDP
Gross Domestic Product
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