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INDUCED GOVERNMENT PURCHASES: Government purchases that depend on income or production (especially national income or gross national product). An increase in national income triggers an increase in induced government purchases. Induced government purchases is graphically depicted as the slope of the government purchases line and is measured by the marginal propensity for government purchases. The induced relation between income and government purchases, as well as other induced expenditures, form the foundation of the multiplier effect triggered by changes in autonomous expenditures.

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

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


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FOUR-FIRM CONCENTRATION RATIO, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2024. [Accessed: May 19, 2024].


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AGGREGATE SUPPLY DECREASE, LONG-RUN AGGREGATE MARKET

A shock to the long-run aggregate market caused by a decrease in aggregate supply, resulting in and illustrated by a leftward shift of the long-run aggregate supply curve. A decrease in aggregate supply in the long-run aggregate market results in an increase in the price level and a decrease in real production. The level of real production resulting from the shock is a smaller level of full-employment real production.

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