Ricardian Equivalence
Ricardian equivalence is the proposition that a government's choice between financing expenditure by taxation and by borrowing does not affect the economy, because households anticipate the future taxes needed to service the debt and adjust their saving accordingly. Proposed by the economist Robert Barro, building on ideas of David Ricardo, the proposition implies that deficit-financed tax cuts do not stimulate consumption, since households save the tax cut to pay the future taxes. The proposition is theoretically elegant but relies on strong assumptions.
The argument
The argument begins with the government's budget constraint, which requires that the present value of spending equal the present value of taxes, since the government must ultimately pay for what it spends. A tax cut financed by borrowing therefore implies higher taxes in the future, when the debt is serviced. If households are forward-looking, they recognise this and increase their saving by the amount of the tax cut, so that they can pay the future taxes without reducing their consumption.
The implication is that the timing of taxation does not matter for consumption and for aggregate demand, so long as the present value of taxes is unchanged. A deficit-financed tax cut and a balanced-budget tax cut have the same effect, because the private sector offsets the change in its saving. Only the level of government spending, not the method of financing it, affects the economy.
Assumptions
The proposition relies on several assumptions. Households must be forward-looking and must understand the government's budget constraint. They must be able to borrow and save freely, so that they can smooth consumption over time. The taxes must be lump-sum, so that they do not distort behaviour. And the current generation must care about future generations, so that it is willing to save for the taxes that they will bear, or the taxes must fall on the same households that receive the tax cut.
Each of these assumptions may fail. Households may not be fully forward-looking, may face borrowing constraints, and may not care about future generations. Taxes are not lump-sum and distort behaviour. Uncertainty about future policy and about the timing of taxes may blur the equivalence. Where the assumptions fail, the proposition may not hold, and deficits may affect demand.
Evidence and debate
The empirical evidence on Ricardian equivalence is mixed. Some studies find that consumption responds less to deficits than simple Keynesian models predict, which is consistent with partial offsetting. Other studies find that consumption rises after tax cuts, particularly for liquidity-constrained households, which is inconsistent with full equivalence. The consensus is that equivalence is a useful benchmark, that offsetting is partial rather than complete, and that the extent of offsetting depends on the circumstances.
The debate has implications for fiscal policy. If households offset deficits by saving more, then deficit-financed stimulus is ineffective, and the case for using fiscal policy to stabilise demand is weakened. If offsetting is limited, particularly when households are liquidity constrained or when the deficit arises from spending rather than tax cuts, then fiscal policy can be effective. The empirical question, rather than the theoretical proposition, determines the policy conclusion.
Policy implications
Ricardian equivalence highlights the importance of the government's budget constraint and of the expectations of households. It implies that a permanent increase in government spending must ultimately be financed by higher taxes, and that the effect on demand depends on how households perceive the financing. It also implies that the composition of fiscal measures matters, since spending has a direct effect on demand while transfers and tax cuts may be partly saved.
The proposition also informs the analysis of fiscal sustainability and of the effects of debt. If households anticipate the taxes needed to service debt, they may save more, which can lower interest rates and mitigate the crowding out of investment. At the same time, the anticipation of future taxes can reduce current consumption, offsetting part of the stimulus from a deficit. The framework thus links the analysis of fiscal policy to the intertemporal choices of households and to the sustainability of the public finances.
Empirical tests
Empirical tests of Ricardian equivalence examine whether consumption responds to changes in the government deficit, holding other influences constant. The tests are difficult because deficits are correlated with the state of the economy, and because the response of households depends on their expectations and on their constraints. Studies use episodes of tax changes, of debt accumulation, and of fiscal consolidation, and they examine the response of consumption and saving.
The results are mixed. Some studies find that consumption responds less to deficits than simple models predict, consistent with partial offsetting, while others find responses consistent with liquidity constraints and with myopia. The evidence suggests that offsetting is partial rather than complete, and that it is larger for tax changes than for spending changes, and larger for households that are not liquidity constrained.
Extensions and qualifications
The proposition has been extended and qualified in various ways. The treatment of uncertainty about future taxes, and of the timing of the fiscal adjustment, affects the extent of offsetting. If households are uncertain about when taxes will rise, they may still save, but the timing of the offsetting is uncertain. If the adjustment is expected to be delayed, the offsetting is also delayed.
The composition of the fiscal change matters. A deficit arising from a cut in taxes may be offset by higher private saving, while a deficit arising from an increase in government spending may not, because the spending itself raises demand. The distinction between tax changes and spending changes is therefore important for the analysis, and it explains why the effects of deficits depend on their source.
Optimal fiscal policy
The framework of Ricardian equivalence informs the analysis of optimal fiscal policy. If households anticipate future taxes, the government's financing decision affects the timing of taxation but not the total burden, and the choice of financing is a matter of smoothing the burden over time and of avoiding distortions. The optimal policy uses debt to smooth taxes and to finance investments with benefits extending over time.
The analysis also considers the constraints on policy. If households are liquidity constrained or myopic, deficit-financed measures can raise demand, and the case for using them in a recession is stronger. The trade-off between the benefits of stimulus and the costs of debt and of future taxes depends on the extent to which equivalence holds, and the empirical evidence informs the assessment of the trade-off.
Policy relevance
Ricardian equivalence is relevant to policy discussions about the effects of deficits and of debt. It suggests that the effects of a deficit depend on the expectations of households and on the credibility of the fiscal framework, and that the composition of the measures matters. It also suggests that the announcement and the communication of fiscal plans affect the behaviour of households and the effectiveness of policy.
The proposition's practical importance is that it reminds policymakers that the public sector's budget constraint is ultimately borne by households, and that the timing of taxation affects the economy through the responses of households to expected future taxes. Whether the offsetting is complete is an empirical question, and the answer differs across countries and circumstances, but the framework provides the analytical discipline for thinking about the effects of fiscal policy over time.