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

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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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