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MARGINAL PROPENSITY TO INVEST: The proportion of each additional dollar of national income that is used for investment expenditures. Or alternatively, this is the change in investment expenditures due to a change in national income. Abbreviated MPI, the marginal propensity to invest is the slope of the investment line used in the analysis of Keynesian economics. As such, it also plays a role in the slope of the aggregate expenditure line and the multiplier effect.
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RETURNS TO SCALE Changes in production the occur when all resources are proportionately changed in the long run. Returns to scale come in three forms--increasing, decreasing, or constant based on whether the changes in production are proportionally more than, less than, or equal to the proportional changes in inputs. Returns to scale are the guiding principle for long-run production, playing a similar role that the law of diminishing marginal returns plays for short-run production.
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BEIGE MUNDORTLE
[What's This?]
Today, you are likely to spend a great deal of time lost in your local discount super center wanting to buy either several orange mixing bowls or clothing for your pet dog. Be on the lookout for fairy dust that tastes like salt.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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"The best way to cheer yourself up is to try to cheer somebody else up." -- Mark Twain
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USDA
United States Department of Agriculture
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