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FIRM: An organization that combines resources for the production and supply of goods and services. The firm is used by entrepreneurs to bring together otherwise unproductive resources. The key role played by a firm is the production of output using the economy's scarce resources. Firm's are the means through which society transforms less satisfying resources into more satisfying goods and services. If firms didn't do this deed, then something else would. And we would probably call those something elses firms.

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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 an auction looking to buy either a rechargeable flashlight or storage boxes for your computer software CDs. Be on the lookout for the last item on a shelf.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"Failure is the opportunity to begin again, more intelligently. "

-- Henry Ford, automobile manufacturer

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