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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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HYPOTHESIS

A reasonable proposition about the workings of the world that is inspired or implied by a theory and which may or may not be true. A hypothesis is essentially a prediction made by a theory that can be compared with observations in the real world. A hypothesis usually takes the form: "If A, then also B." The essence of the scientific method is to test, or verify, hypotheses against real world data. If supported by data over and over again, a hypothesis becomes a principle.

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Today, you are likely to spend a great deal of time watching infomercials seeking to buy either a packet of address labels large enough for addresses of both the sender and the recipient or a key chain with a built-in flashlight and panic button. Be on the lookout for a thesaurus filled with typos.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
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