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INCREASING RETURNS TO SCALE: A given proportionate increase in all resources in the long run results in a proportionately greater increase in production. Increasing returns to scale exists if a firm increases ALL resources -- labor, capital, and other inputs -- by 10%, and output increases by more than 10%. You might want to compare decreasing returns to scale and constant returns to scale.

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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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In the early 1900s around 300 automobile companies operated in the United States.
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