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SHUTDOWN RULE: A rule stating that firm minimizes economic loss by producing no output in the short run if price is less than average variable cost. In the short run, a firm incurs total fixed cost whether or not it produces any output. As such, if the market price is falls below average total cost, it must decide if the economic loss from producing the quantity of output that equates marginal revenue and marginal cost is more or less than the economic loss incurred with shutting down production in the short run (which is equal to total fixed cost).

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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 |


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MARGINAL PROPENSITY TO INVEST, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2023. [Accessed: May 30, 2023].


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TAXATION PRINCIPLES

Taxes are the mandatory payments made by members of society to governments to finance government operations. The study of public finance identifies several key principles of taxation -- tax effects (revenue and allocation), tax proportionality (proportional, progressive, and regressive), tax payments (benefit and ability-to-pay), tax equity (horizontal and vertical).

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