5.4 Government Deficits and the National Debt

Deficits vs. Debt

A budget deficit occurs when government spending exceeds tax revenue in a single year, forcing the government to borrow. The national debt is the accumulation of all past deficits (minus any surpluses) over time. Running a deficit adds to the debt; a budget surplus can help pay it down.

Financing Deficits: Crowding Out

Governments finance deficits by selling bonds, increasing the demand for loanable funds and raising interest rates. Higher interest rates can cause crowding out, where reduced private investment and consumption offset the stimulative effect of expansionary fiscal policy, potentially slowing long-run economic growth and capital formation.

Debt Sustainability Concerns

A large national debt raises concerns about future debt service (interest payments), potential tax increases, or inflation if debt is monetized. Economists often examine debt as a percentage of GDP rather than absolute dollar amounts, since a growing economy can support larger debt loads without becoming unsustainable.

Key terms

Budget deficit

When government spending exceeds tax revenue in a given year, requiring borrowing.

National debt

The total accumulation of past budget deficits minus surpluses.

Crowding out

Reduced private investment/consumption caused by higher interest rates from government borrowing to finance deficits.

Budget surplus

When tax revenue exceeds government spending in a given year; can be used to pay down debt.

Debt-to-GDP ratio

A measure of national debt relative to the size of the economy, used to assess debt sustainability.

Try an AP-style question

A budget deficit occurs when…

1. the national debt is fully paid off
2. exports exceed imports in a year
3. revenue exceeds spending in a year
4. spending exceeds revenue in a year