Ricardian equivalence

Ricardian equivalence is the proposition that government borrowing and current taxation have equivalent effects when households anticipate future taxes and adjust saving accordingly. Its result depends on idealized assumptions about foresight, credit access, and government finances.

Government budget constraint: An accounting relation requiring government spending and debt obligations to be financed by taxes, borrowing, or money creation. It links current borrowing to the future taxes assumed to offset it.
Perfect capital market: An idealized financial market in which participants can borrow and lend freely at a common interest rate. Unrestricted lending lets households save tax cuts for anticipated future taxes.
Keynesian economics: An economic tradition emphasizing demand fluctuations and the potential for policy to stabilize output and employment. Keynesian accounts often predict that debt-financed tax cuts can raise demand.
Tax rebate: A repayment of taxes to households, often used as a temporary fiscal stimulus. Rebate responses reveal whether households save temporary tax relief or spend it.
David Ricardo: A British political economist whose writings shaped classical theories of trade, value, and public finance. Ricardo discussed whether public borrowing is equivalent to current taxation.
Permanent income hypothesis: A theory that households base consumption on expected long-run income rather than current income alone. It helps explain why a temporary tax cut need not raise consumption.
Rational expectations: An approach in which economic forecasts use available information and are consistent with the model of the economy. Households must foresee the fiscal consequences of borrowing for the neutrality result.
Liquidity constraint: A limit on borrowing that prevents an agent from spending against future income or wealth. Constrained households may spend a tax cut rather than save it for future taxes.
Fiscal stimulus: Government measures intended to increase aggregate demand and support economic activity. Debt neutrality bears directly on whether borrowing-funded stimulus can raise spending.
Principles of Political Economy and Taxation: David Ricardo’s 1817 book on political economy, taxation, rent, and international trade. Ricardo’s discussion of public debt appears in this influential work.

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