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December 11, 2018 

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INFLATION: A persistent increase in the average price level in the economy. Inflation occurs when the AVERAGE price level (that is, prices IN GENERAL) increases over time. This does NOT mean that ALL prices increase the same, nor that ALL prices necessarily increase. Some prices might increase a lot, others a little, and still other prices decrease or remain unchanged. Inflation results when the AVERAGE of these assorted prices follows an upward trend. Inflation is the most common phenomenon associated with the price level.

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EIGHT-FIRM CONCENTRATION RATIO: The proportion of total output in an industry that's produced by the eight largest firms in the industry. This is one of two common concentration ratios. The other is the four-firm concentration ratio. The eight-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and how market control is held by the eight largest firms in the industry.

     See also | concentration ratio | four-firm concentration ratio | market share | market control | oligopoly | monopolistic competition |


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EIGHT-FIRM CONCENTRATION RATIO, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2018. [Accessed: December 11, 2018].


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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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