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POSITIVE RELATION: A relation, either a principle or hypothesis, in which an increase one variable is associated with an increase in the other variable. A positive, or direct, relation is most commonly illustrated by an upward sloping line. It can also be represented by an equation in which the slope value is positive.

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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 dollar discount store looking to buy either a revolving spice rack or a how-to book on home repairs. Be on the lookout for door-to-door salesmen.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Time is the scarcest resource, and unless it is managed nothing else can be managed."

-- Peter F. Drucker

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