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TOTAL PRODUCT AND AVERAGE PRODUCT: A graphical connection between total product curve and average product curve stating that the slope of a line between the origin and any point on the total product curve is equal to the average product. Imagine a ray shooting out of the origin and hitting the total product curve. As this ray hits each point on the curve, remaining anchored at the origin, the slope of the ray changes. And the slope of this ray is average product.

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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 New York Yankees baseball cap or a solid oak entertainment center. Be on the lookout for telephone calls from long-lost relatives.
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Three-forths of the gold mined each year is used to manufacture jewelry.
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