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COMPLEMENT-IN-PRODUCTION: One of two goods that are produced jointly using the same resource -- that is, the production of one good automatically triggers the production of the other. The terms "joint products" or "by-products" are two terms commonly used for complements-in-production. A complement-in-production is one of two alternatives falling within the other prices determinant of supply. The other is a substitute-in-production. An increase in the price of one complement-in-production causes a increase in supply of the other. Complements-in-production are goods produced jointly from the same resource or input. This typically happens when the resource in question has parts that can be separated into different products. One example is the production of two goods -- beef and leather -- from one resource -- cattle. Another complement in production example is lumber and sawdust, both produced from a single tree.

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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 flea market trying to buy either a how-to book on meeting people or clothing for your pet iguana. Be on the lookout for strangers with large satchels of used undergarments.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"When we do the best we can, we never know what miracle is wrought in our life or in the life of another. "

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