How Do Government Spending Decisions Affect Your Money?

When the government spends more than it collects in taxes, it runs a budget deficit and borrows by issuing Treasury bonds. This fiscal policy — the deliberate use of spending and taxation — is one of two levers for managing the economy (the other being monetary policy). For investors, deficit dynamics directly affect Treasury yields and the risk-free rate underlying all asset pricing.

Budget Deficit = Government Spending − Tax Revenue. Deficit spending is expansionary (raises GDP); spending cuts or tax hikes are contractionary. The multiplier effect means a $1 increase in government spending raises GDP by more than $1 — multiplier = 1 / (1 − MPC). But crowding out can offset this: heavy government borrowing raises interest rates, reducing private investment. Debt sustainability requires growth rate > interest rate (r < g).