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WANT: This is often thought of as a psychological desire which makes life just a little more enjoyable, but which is not physiological necessary to life. You need oxygen, but you want a hot fudge sundae. Satisfaction is achieved by fulfilling wants.

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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 at a crowded estate auction looking to buy either a set of luggage with wheels or a birthday gift for your aunt. Be on the lookout for door-to-door salesmen.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"The truth is not for all men, but only for those who seek it. "

-- Ayn Rand, writer

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