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Optimal monetary policy in a model of the credit channel

  • De Fiore, Fiorella
  • Tristani, Oreste

We consider a simple extension of the basic new-Keynesian setup in which we relax the assumption of frictionless financial markets. In our economy, asymmetric information and default risk lead banks to optimally charge a lending rate above the risk-free rate. Our contribution is threefold. First, we derive analytically the loglinearised equations which characterise aggregate dynamics in our model and show that they nest those of the new- Keynesian model. A key difference is that marginal costs increase not only with the output gap, but also with the credit spread and the nominal interest rate. Second, we find that financial market imperfections imply that exogenous disturbances, including technology shocks, generate a trade-off between output and inflation stabilisation. Third, we show that, in our model, an aggressive easing of policy is optimal in response to adverse financial market shocks. JEL Classification: E52, E44

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Paper provided by European Central Bank in its series Working Paper Series with number 1043.

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Date of creation: Apr 2009
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Handle: RePEc:ecb:ecbwps:20091043
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  1. Frank Smets & Raf Wouters, 2007. "Shocks and Frictions in US Business Cycles : a Bayesian DSGE Approach," Working Paper Research 109, National Bank of Belgium.
  2. De Fiore, Fiorella & Tristani, Oreste, 2008. "Credit and the natural rate of interest," Working Paper Series 0889, European Central Bank.
  3. (Kim | Lopez-Salido | Swanson) & Andrew Levin, 2004. "The magnitude and Cyclical Behavior of Financial Market Frictions," Computing in Economics and Finance 2004 224, Society for Computational Economics.
  4. Timothy S. Fuerst & Charles T. Carlstrom, 1998. "Agency costs and business cycles," Economic Theory, Springer, vol. 12(3), pages 583-597.
  5. Townsend, Robert M., 1979. "Optimal contracts and competitive markets with costly state verification," Journal of Economic Theory, Elsevier, vol. 21(2), pages 265-293, October.
  6. Christiano, Lawrence & Ilut, Cosmin & Motto, Roberto & Rostagno, Massimo, 2008. "Monetary policy and stock market boom-bust cycles," Working Paper Series 0955, European Central Bank.
  7. Charles T. Carlstrom & Timothy S. Fuerst, 1996. "Agency costs, net worth, and business fluctuations: a computable general equilibrium analysis," Working Paper 9602, Federal Reserve Bank of Cleveland.
  8. Gale, Douglas & Hellwig, Martin, 1985. "Incentive-Compatible Debt Contracts: The One-Period Problem," Review of Economic Studies, Wiley Blackwell, vol. 52(4), pages 647-63, October.
  9. Bernanke, B. & Gertler, M. & Gilchrist, S., 1998. "The Financial Accelerator in a Quantitative Business Cycle Framework," Working Papers 98-03, C.V. Starr Center for Applied Economics, New York University.
  10. Ester Faia, 2008. "Optimal Monetary Policy with Credit Augmented Liquidity Cycles," 2008 Meeting Papers 414, Society for Economic Dynamics.
  11. Faia, Ester & Monacelli, Tommaso, 2007. "Optimal interest rate rules, asset prices, and credit frictions," Journal of Economic Dynamics and Control, Elsevier, vol. 31(10), pages 3228-3254, October.
  12. Christiano, Lawrence J & Eichenbaum, Martin, 1992. "Liquidity Effects and the Monetary Transmission Mechanism," American Economic Review, American Economic Association, vol. 82(2), pages 346-53, May.
  13. Gilchrist, Simon & Leahy, John V., 2002. "Monetary policy and asset prices," Journal of Monetary Economics, Elsevier, vol. 49(1), pages 75-97, January.
  14. Ravenna, Federico & Walsh, Carl E., 2006. "Optimal monetary policy with the cost channel," Journal of Monetary Economics, Elsevier, vol. 53(2), pages 199-216, March.
  15. Glenn D. Rudebusch, 2006. "Monetary Policy Inertia: Fact or Fiction?," International Journal of Central Banking, International Journal of Central Banking, vol. 2(4), December.
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