Policy-Ineffectiveness Proposition

Content and background

The policy-ineffectiveness proposition is a signature conclusion of New Classical macroeconomics, set out by Thomas Sargent and Neil Wallace in papers in 1975 and 1976. Keynesian economics, dominant through the 1960s, held that expanding the money supply could stimulate the economy and exploit the Phillips curve trade-off to lower unemployment. Milton Friedman (1968) argued the trade-off disappears in the long run but accepted short-run effects. Sargent and Wallace combined John Muth's (1961) rational expectations with Robert Lucas's (1972) model to make a stronger claim: if people know the policy rule, form expectations rationally, and prices and wages adjust quickly to market-clearing levels, then systematic, anticipated monetary policy is fully reflected in expected inflation and has no effect on real output. Only unanticipated policy shocks can change output, and only temporarily.

The Lucas model and the empirical debate

The proposition rests on Lucas's (1972, 1973) imperfect-information or "islands" model. Each producer observes only the price of its own good immediately and raises output only when it mistakes a general price rise for a rise in its relative price; anticipated money growth cannot create that confusion. Robert Barro (1977) split U.S. money growth into anticipated and unanticipated components and found that only the unanticipated part affected unemployment. Frederic Mishkin (1982), however, using longer lags and joint tests, found that anticipated monetary policy also affects output, and Robert Gordon (1982) rejected the proposition based on U.S. price inertia from 1890 to 1980. Bennett McCallum (1979), surveying the debate, noted that test results were sensitive to how expectations were modeled and to model assumptions. The proposition pairs with the Lucas critique, which challenged the premises of policy evaluation.

The rigidity critique and later assessment

The strongest objection came from price and wage rigidity. Stanley Fischer (1977) and John Taylor (1980) showed that even with rational expectations, if wages are set in multi-period contracts with staggered timing, monetary policy chosen after contracts are signed can stabilize output even when anticipated. This became the starting point of New Keynesian economics, which combines rational expectations with nominal rigidity, and in the New Keynesian models central banks use today (Galí, 2015) anticipated policy paths do affect the real economy. Even so, the proposition changed macroeconomic method by highlighting that expectations determine policy effects, that systematically repeated policies lose force as people learn them, and that credibility and time inconsistency matter. Sargent received the Nobel Prize in 2011. The proposition is still cited in debates over the effects of policies targeting monetary aggregates.

FAQ

Does the proposition mean all monetary policy is ineffective?

No. It claims that systematic policy people can anticipate does not affect real variables, while unanticipated policy shocks can temporarily change output and employment.

Why is the policy-ineffectiveness proposition not widely accepted today?

Fischer and Taylor showed that contracts make prices and wages adjust slowly, empirical rebuttals followed, and New Keynesian models in which anticipated policy matters in the short run became mainstream.

Sources reviewed: 2026-10-26

References

1. Sargent, T. J., & Wallace, N. (1975). 'Rational' expectations, the optimal monetary instrument, and the optimal money supply rule. Journal of Political Economy, 83(2), 241–254.
2. Sargent, T. J., & Wallace, N. (1976). Rational expectations and the theory of economic policy. Journal of Monetary Economics, 2(2), 169–183.
3. Lucas, R. E., Jr. (1972). Expectations and the neutrality of money. Journal of Economic Theory, 4(2), 103–124.
4. Lucas, R. E., Jr. (1973). Some international evidence on output-inflation tradeoffs. American Economic Review, 63(3), 326–334.
5. Muth, J. F. (1961). Rational expectations and the theory of price movements. Econometrica, 29(3), 315–335.
6. Barro, R. J. (1977). Unanticipated money growth and unemployment in the United States. American Economic Review, 67(2), 101–115.
7. Mishkin, F. S. (1982). Does anticipated monetary policy matter? An econometric investigation. Journal of Political Economy, 90(1), 22–51.
8. Fischer, S. (1977). Long-term contracts, rational expectations, and the optimal money supply rule. Journal of Political Economy, 85(1), 191–205.
9. Taylor, J. B. (1980). Staggered wage setting in a macro model. Journal of Political Economy, 88(1), 1–23.
10. McCallum, B. T. (1979). The current state of the policy-ineffectiveness debate. American Economic Review, 69(2), 240–245.
11. Gordon, R. J. (1982). Price inertia and policy ineffectiveness in the United States, 1890–1980. Journal of Political Economy, 90(6), 1087–1117.
12. Friedman, M. (1968). The role of monetary policy. American Economic Review, 58(1), 1–17.
13. Galí, J. (2015). Monetary Policy, Inflation, and the Business Cycle (2nd ed.). Princeton, NJ: Princeton University Press.