Fiscal Sustainability in a New Keynesian Model - Additional Appendix
Recent work on optimal monetary and fiscal policy in New Keynesian models suggests that it is optimal to allow steady-state debt to follow a random walk. Leith and Wren-Lewis (2012) consider the nature of the timeinconsistency involved in such a policy and its implication for discretionary policy-making. We show that governments are tempted, given inflationary expectations, to utilize their monetary and fiscal instruments in the initial period to change the ultimate debt burden they need to service. We demonstrate that this temptation is only eliminated if following shocks, the new steady-state debt is equal to the original (efficient) debt level even though 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 stabilize 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. Finally, we assess the credibility of commitment policy by considering a quasi-commitment policy which allows for different probabilities of reneging on past promises. This on-line Appendix extends the results of this paper.
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- Campbell Leith & Simon Wren-Lewis, 2006.
"Fiscal Sustainability in a New Keynesian Model,"
2006_11, Business School - Economics, University of Glasgow, revised Nov 2008.
- Campbell Leith & Simon Wren-lewis, 2006. "Fiscal Sustainability in a New Keynesian Model," WEF Working Papers 0006, ESRC World Economy and Finance Research Programme, Birkbeck, University of London.
- Simon Wren-Lewis & Campbell Leith, 2007. "Fiscal Sustainability in a New Keynesian Model," Economics Series Working Papers 310, University of Oxford, Department of Economics.
- Leith, Campbell & Wren-Lewis, Simon, 2012. "Fiscal Sustainability in a New Keynesian Model," SIRE Discussion Papers 2012-84, Scottish Institute for Research in Economics (SIRE).
- Schaumburg, Ernst & Tambalotti, Andrea, 2007.
"An investigation of the gains from commitment in monetary policy,"
Journal of Monetary Economics,
Elsevier, vol. 54(2), pages 302-324, March.
- Ernst Schaumburg & Andrea Tambalotti, 2003. "An Investigation of the Gains from Commitment in Monetary Policy," Macroeconomics 0302004, EconWPA.
- Andrea Tambalotti & Ernst Schaumburg, 2004. "An Investigation of the Gains from Commitment in Monetary Policy," Econometric Society 2004 North American Summer Meetings 282, Econometric Society.
- Ernst Schaumburg & Andrea Tambalotti, 2003. "An investigation of the gains from commitment in monetary policy," Staff Reports 171, Federal Reserve Bank of New York.
- Debortoli, Davide & Nunes, Ricardo, 2010. "Fiscal policy under loose commitment," Journal of Economic Theory, Elsevier, vol. 145(3), pages 1005-1032, May.
- Christoph Himmels & Tatiana Kirsanova, 2011.
"Expectations Traps and Monetary Policy with Limited Commitment,"
1102, Exeter University, Department of Economics.
- Himmels, Christoph & Kirsanova, Tatiana, 2011. "Expectations Traps and Monetary Policy with Limited Commitment," MPRA Paper 29208, University Library of Munich, Germany.
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