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AE LINE: Another term for aggregate expenditure line, which is a line representing the relation between aggregate expenditures and gross domestic product used in the Keynesian cross. The aggregate expenditure line is obtained by adding investment expenditures, government purchases, and net exports to the consumption line. As such, the slope of the aggregate expenditure line is largely based on the slope of the consumption line (which is the marginal propensity to consume), with adjustments coming from the marginal propensity to invest, the marginal propensity for government purchases, and the marginal propensity to import. The intersection of the aggregate expenditures line and the 45-degree line identifies the equilibrium level of output in the Keynesian cross.
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                           SLOPE, INVESTMENT LINE: The positive slope of the investment line is also termed the marginal propensity to invest (MPI). This slope is greater than zero but less than one, reflecting induced investment. The slope of the investment line affects the slope of the aggregate expenditures line and thus also affects the magnitude of the multiplier process. | Investment Line | 
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The investment line, also termed propensity-to-invest line or investment function, shows the relation between investment expenditures by the business sector and the level of aggregate income or production. The income and production measures most commonly used are national income and gross domestic product.A representative investment line is presented in the exhibit to the right. This red line, labeled I in the exhibit, is positively sloped, indicating that greater levels of income or production generate greater investment expenditures by the business sector. This positive relation indicates that the business sector is inclined to divert higher profits generated by an expanding economy to investment expenditures on capital goods. The investment line graphically illustrates the investment-income relation for the business sector, which plays a key role in the aggregate expenditures line used in Keynesian economics to identify equilibrium income and production. The slope of the investment line presented here is positive, but less than one. In fact, the slope of the investment line is numerically equal to the marginal propensity to invest. In this case the slope is equal to 0.1. The positive slope reflects induced investment expenditures--more income means more investment. Click the [Slope] button to illustrate. To illustrate the equality between slope and the marginal propensity to invest, consider the equations for each. The slope of the investment line is specified as the "rise" over the "run." The rise is the change in investment measured on the vertical axis and the run is the change in income measured on the horizontal axis. | slope | = | rise
run | = | change in investment
change in income |
The marginal propensity to invest (MPI) is the incremental change in investment resulting from an incremental change in income. | MPI | = | change in investment
change in income |
The slope of the investment line is the marginal propensity to invest, they are one and the same.The positive slope of the investment line reflects induced investment, which is investment that depends on the level of income. If the aggregate economy has more income, then the business sector is induced to undertake additional investment expenditures. Of course, a drop in aggregate income induces the business sector to reduce expenditures.
Recommended Citation:SLOPE, INVESTMENT LINE, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2023. [Accessed: March 25, 2023].
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