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PERFECT COMPETITION, PROFIT MAXIMIZATION: A perfectly competitive firm is presumed to produce the quantity of output that maximizes economic profit--the difference between total revenue and total cost. This production decision can be analyzed directly with economic profit, by identifying the greatest difference between total revenue and total cost, or by the equality between marginal revenue and marginal cost.

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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 visiting every yard sale in a 30-mile radius hoping to buy either a large, stuffed giraffe or a birthday greeting card for your aunt. Be on the lookout for telephone calls from long-lost relatives.
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In the early 1900s around 300 automobile companies operated in the United States.
"The past cannot be changed. The future is yet in your power. "

-- Hugh White, U.S. Senator

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