// multi-utility computation suite · offline · instant · precise
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fin.multiplier-effect-Keynesian Calculator
Calculates the Keynesian spending multiplier and GDP impact of a fiscal stimulus from MPC and tax rate. The multiplier is 1/(1 − MPC × (1 − t)) — a marginal propensity to consume of 0.8 with a 30% tax rate gives a multiplier of approximately 2.4.
Inputs
Mpc
Profit as a percentage of revenue. Margin % is always lower than markup % — a $5 profit on a $15 selling price is 33% margin but 50% markup.
Delta G Usd
Reference formula or conversion factor shown for context.
Results
spending multiplier k
Gratuity amount — the suggested amount to add to the bill as a service tip.
change in GDP ΔY ($)
Sample size or count used in the calculation.
marginal propensity to save MPS
Sample size or count used in the calculation.
rounds to 99% effect
Sample size or count used in the calculation.
k = 1 / MPS = 1 / (1 − MPC)
Reference formula or conversion factor shown for context.
tax multiplier (for comparison)
Gratuity amount — the suggested amount to add to the bill as a service tip.