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OLIGOPOLY, REALISM: Real world markets are heavily populated by oligopoly. About half of all output produced in the U.S. economy each year is done so by oligopoly firms. Other industrialized nations can make a similar claim. Oligopoly markets arise in a wide assortment different industries, ranging from manufacturing to retail trade to resource extraction to financial services.

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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.

     See also | investment expenditures | national income | investment line | Keynesian economics | multiplier | aggregate expenditures line | marginal propensity to consume | marginal propensity to save | marginal propensity to import | marginal propensity for government purchases |


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MARGINAL PROPENSITY TO INVEST, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: December 7, 2025].


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EQUILIBRIUM, SHORT-RUN AGGREGATE MARKET

The state of equilibrium that exists in the short-run aggregate market when real aggregate expenditures are equal to full-employment real production with no imbalances to induce changes in the price level or real production. The opposing forces of aggregate demand (the buyers) and short-run aggregate supply (the sellers) exactly offset each other. At the existing price level, the four macroeconomic sectors (household, business, government, and foreign) purchase all of the real production that they seek and producers sell all of the real production that they have.

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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
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