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Fiscal Sustainability in a New Keynesian Model

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  • Campbell Leith
  • Simon Wren-Lewis

Abstract

Most recent work deriving optimal monetary policy utilising New Neo-Classical Synthesis (NNCS) models abstract from the impact of monetary policy on the government’s finances, by assuming the existence of lump sum taxes. In this paper, we assume that the government does not have access to such taxes to satisfy its intertemporal budget constraint in the face of shocks. We then consider optimal monetary and fiscal policies under discretion and commitment in the face of technology, preference and cost-push shocks. We find that the optimal precommitment policy implies a random walk in the steady-state level of debt, generalising earlier results that involved only a single fiscal instrument. We also find that the time-inconsistency in the optimal precommitment policy is such that governments are tempted, given inflationary expectations, to utilise their monetary and fiscal instruments in the initial period to change the ultimate debt burden they need to service. We show that this temptation is only eliminated if following shocks, the new steady-state debt is equal to the original (efficient) debt level. This implies that under a discretionary policy the random walk result is overturned: debt will always be returned to this initial steady-state even although there is no explicit debt target in the government’s objective function. Analytically and in a series of numerical simulations we show which instrument is used to stabilise the debt depends crucially on the degree of nominal inertia and the size of the debt-stock. We also show that the welfare consequences of introducing debt are negligible for precommitment policies, but can be significant for discretionary policy.

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Bibliographic Info

Paper provided by Business School - Economics, University of Glasgow in its series Working Papers with number 2006_11.

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Date of creation: Oct 2006
Date of revision: Nov 2008
Handle: RePEc:gla:glaewp:2006_11

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  1. Leith, Campbell & Malley, Jim, 2005. "Estimated general equilibrium models for the evaluation of monetary policy in the US and Europe," European Economic Review, Elsevier, vol. 49(8), pages 2137-2159, November.
  2. Benigno, Pierpaolo & Woodford, Michael, 2004. "Optimal monetary and fiscal policy: a linear-quadratic approach," Working Paper Series 0345, European Central Bank.
  3. Leith, Campbell & Wren-Lewis, Simon, 2000. "Interactions between Monetary and Fiscal Policy Rules," Economic Journal, Royal Economic Society, vol. 110(462), pages C93-108, March.
  4. Smets, Frank & Wouters, Raf, 2004. "Comparing shocks and frictions in US and euro area business cycles: a Bayesian DSGE approach," Working Paper Series 0391, European Central Bank.
  5. V.V. Chari & Lawrence J. Christiano & Patrick J. Kehoe, 1991. "Optimal fiscal and monetary policy: some recent results," Proceedings, Federal Reserve Bank of Cleveland, pages 519-546.
  6. Maurice Obstfeld, 1989. "Dynamic Seigniorage Theory: An Exploration," NBER Working Papers 2869, National Bureau of Economic Research, Inc.
  7. Leith, Campbell & Wren-Lewis, Simon, 2006. "Compatibility between monetary and fiscal policy under EMU," European Economic Review, Elsevier, vol. 50(6), pages 1529-1556, August.
  8. Peter N. Ireland, 2004. "Technology Shocks in the New Keynesian Model," NBER Working Papers 10309, National Bureau of Economic Research, Inc.
  9. Lombardo, Giovanni & Sutherland, Alan, 2003. "Monetary and fiscal interactions in open economies," Working Paper Series 0289, European Central Bank.
  10. Calvo, Guillermo A., 1983. "Staggered prices in a utility-maximizing framework," Journal of Monetary Economics, Elsevier, vol. 12(3), pages 383-398, September.
  11. Bernheim, B Douglas, 1991. "Optimal Fiscal and Monetary Policy: Some Recent Results," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 23(3), pages 540-42, August.
  12. Soderlind, Paul, 1999. "Solution and estimation of RE macromodels with optimal policy," European Economic Review, Elsevier, vol. 43(4-6), pages 813-823, April.
  13. Obstfeld, Maurice, 1997. "Dynamic Seigniorage Theory," Macroeconomic Dynamics, Cambridge University Press, vol. 1(03), pages 588-614, September.
  14. Barro, Robert J., 1979. "On the Determination of the Public Debt," Scholarly Articles 3451400, Harvard University Department of Economics.
  15. Martin Ellison & Neil Rankin, 2005. " Optimal Monetary Policy When Lump-Sum Taxes Are Unavailable: A Reconsideration of the Outcomes under Commitment and Discretion," CDMA Conference Paper Series 0501, Centre for Dynamic Macroeconomic Analysis.
  16. Beetsma, Roel & Jensen, Henrik, 2003. "Mark-Up Fluctuations and Fiscal Policy Stabilization in a Monetary Union," CEPR Discussion Papers 4020, C.E.P.R. Discussion Papers.
  17. Campbell Leith & Simon Wren-lewis, 2006. "The Costs of Fiscal Inflexibility," WEF Working Papers 0005, ESRC World Economy and Finance Research Programme, Birkbeck, University of London.
  18. Richard Clarida & Jordi Gali & Mark Gertler, 2001. "Optimal Monetary Policy in Open versus Closed Economies: An Integrated Approach," American Economic Review, American Economic Association, vol. 91(2), pages 248-252, May.
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  1. Time inconsistency and debt
    by Mainly Macro in Mainly Macro on 2014-03-28 16:35:00
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