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Fiscal Policy Lab

Interactive fiscal-policy simulator: set tax rate, spending and interest rate to watch budget deficit or surplus feed a growing national-debt tower year by year, and fire a spending shock to see the 1/(1-MPC) multiplier ripple through GDP round by round.

Economics & Social Systems3DModerate60 FPS🔥 Fire

This simulator turns the mechanics of budget policy into something you can watch happen. Two bars track government revenue and spending live; whenever spending outruns revenue the deficit is borrowed and stacks onto a debt tower year after year, with a marker at the 60%-of-GDP line economists often cite as a safety threshold. A separate control lets you fire a one-off spending shock and watch the 1/(1−MPC) multiplier play out as a sequence of expanding, diminishing rounds — the same round-by-round re-spending that turns a $100bn outlay into a much larger GDP move.

⚙ Under the hood

Set tax rate, spending and interest rate to watch budget deficit or surplus feed a growing national-debt tower year by year, then fire a spending shock and watch the 1/(1-MPC) multiplier ripple through GDP round by round.

fiscal policybudget deficitnational debtspending multiplierMPCmacroeconomicsdebt-to-GDP

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install