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 |

MARGINAL PROPENSITY TO INVEST, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: July 21, 2026].

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Unemployment attributable to relatively regular and predictable declines in particular industries or occupations over the course of a year, often corresponding with the climatic seasons. Unlike cyclical unemployment, which may or may not occur at any given time, seasonal unemployment is an essential part of many jobs. For example, a regular, run-of-the-mill, department store Santa Clause can count on 11 months of unemployment each year. Seasonal unemployment is one of four unemployment sources. The other three are cyclical unemployment, frictional unemployment, and structural unemployment.

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