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Characterizing monetary and fiscal policy rules and interactions when commodity prices matter

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  • Chuku Chuku
  • Paul Middleditch

Abstract

Using conventional rules to characterize policy behaviour in emerging market economies requires innovations capable of capturing distinctive structural characteristics. We examine the extent to which commodity price fluctuations matter for monetary and fiscal policy formulation in high primary commodity export economies. Markov mixture specifications of monetary and fiscal policy rules stylized to account for commodity price slacks are estimated using specifically designed Bayesian techniques. We find that policy authorities indeed respond to commodity price slacks but with variations depending on the policy regime in place and country. The results hold implications for the correct specification of policy rules and interactions in DSGE models for such economies.

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  • Chuku Chuku & Paul Middleditch, 2016. "Characterizing monetary and fiscal policy rules and interactions when commodity prices matter," Centre for Growth and Business Cycle Research Discussion Paper Series 222, Economics, The University of Manchester.
  • Handle: RePEc:man:cgbcrp:222
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    1. Frankel, Jeffrey A. & Vegh, Carlos A. & Vuletin, Guillermo, 2013. "On graduation from fiscal procyclicality," Journal of Development Economics, Elsevier, vol. 100(1), pages 32-47.
    2. Pierre Siklos & Martin Bohl, 2009. "Asset Prices as Indicators of Euro Area Monetary Policy: An Empirical Assessment of Their Role in a Taylor Rule," Open Economies Review, Springer, vol. 20(1), pages 39-59, February.
    3. Carmen M. Reinhart & Kenneth S. Rogoff, 2009. "Varieties of Crises and Their Dates," Introductory Chapters, in: This Time Is Different: Eight Centuries of Financial Folly, Princeton University Press.
    4. Bernanke, Ben S. & Gertler, Mark & Gilchrist, Simon, 1999. "The financial accelerator in a quantitative business cycle framework," Handbook of Macroeconomics, in: J. B. Taylor & M. Woodford (ed.), Handbook of Macroeconomics, edition 1, volume 1, chapter 21, pages 1341-1393, Elsevier.
    5. Geweke, John, 1989. "Bayesian Inference in Econometric Models Using Monte Carlo Integration," Econometrica, Econometric Society, vol. 57(6), pages 1317-1339, November.
    6. Prebisch, Raúl, 1950. "The economic development of Latin America and its principal problems," Sede de la CEPAL en Santiago (Estudios e Investigaciones) 29973, Naciones Unidas Comisión Económica para América Latina y el Caribe (CEPAL).
    7. Ben S. Bernanke & Mark Gertler, 2001. "Should Central Banks Respond to Movements in Asset Prices?," American Economic Review, American Economic Association, vol. 91(2), pages 253-257, May.
    8. Woodford, Michael, 2001. "Fiscal Requirements for Price Stability," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 33(3), pages 669-728, August.
    9. Graciela L. Kaminsky & Carmen M. Reinhart & Carlos A. Végh, 2005. "When It Rains, It Pours: Procyclical Capital Flows and Macroeconomic Policies," NBER Chapters, in: NBER Macroeconomics Annual 2004, Volume 19, pages 11-82, National Bureau of Economic Research, Inc.
    10. Emmanuel Farhi & Ricardo Caballero & Pierre-Olivier Gourinchas, "undated". "Financial Crash, Commodity Prices and Global Imbalances," Working Paper 20933, Harvard University OpenScholar.
    11. Taylor, John B. & Williams, John C., 2010. "Simple and Robust Rules for Monetary Policy," Handbook of Monetary Economics, in: Benjamin M. Friedman & Michael Woodford (ed.), Handbook of Monetary Economics, edition 1, volume 3, chapter 15, pages 829-859, Elsevier.
    12. Goodfriend, Marvin, 1991. "Interest rates and the conduct of monetary policy," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 34(1), pages 7-30, January.
    13. Frederic S. Miskin & Klaus Schmidt-Hebbel, 2007. "Does Inflation Targeting Make a Difference?," Central Banking, Analysis, and Economic Policies Book Series, in: Frederic S. Miskin & Klaus Schmidt-Hebbel & Norman Loayza (Series Editor) & Klaus Schmidt-Hebbel (Se (ed.),Monetary Policy under Inflation Targeting, edition 1, volume 11, chapter 9, pages 291-372, Central Bank of Chile.
    14. Davig, Troy & Leeper, Eric M., 2011. "Monetary-fiscal policy interactions and fiscal stimulus," European Economic Review, Elsevier, vol. 55(2), pages 211-227, February.
    15. Woodford, Michael, 1995. "Price-level determinacy without control of a monetary aggregate," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 43(1), pages 1-46, December.
    16. Grilli, Enzo R & Yang, Maw Cheng, 1988. "Primary Commodity Prices, Manufactured Goods Prices, and the Terms of Trade of Developing Countries: What the Long Run Shows," The World Bank Economic Review, World Bank, vol. 2(1), pages 1-47, January.
    17. Yamada, Hiroshi & Yoon, Gawon, 2014. "When Grilli and Yang meet Prebisch and Singer: Piecewise linear trends in primary commodity prices," Journal of International Money and Finance, Elsevier, vol. 42(C), pages 193-207.
    18. Henning Bohn, 1998. "The Behavior of U. S. Public Debt and Deficits," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 113(3), pages 949-963.
    19. V. Anton Muscatelli & Patrizio Tirelli & Carmine Trecoci, 2002. "Does Institutional Change Really Matter? Inflation Targets, Central Bank Reform and Interest Rate Policy in the OECD Countries," Manchester School, University of Manchester, vol. 70(4), pages 487-527, June.
    20. Reinhart, Karmen & Rogoff, Kenneth, 2009. ""This time is different": panorama of eight centuries of financial crises," Ekonomicheskaya Politika / Economic Policy, Russian Presidential Academy of National Economy and Public Administration, vol. 1, pages 77-114, March.
    21. Goldfeld, Stephen M. & Quandt, Richard E., 1973. "A Markov model for switching regressions," Journal of Econometrics, Elsevier, vol. 1(1), pages 3-15, March.
    22. Clarida, Richard & Gali, Jordi & Gertler, Mark, 1998. "Monetary policy rules in practice Some international evidence," European Economic Review, Elsevier, vol. 42(6), pages 1033-1067, June.
    23. Sylvia Kaufmann, 2002. "Is there an asymmetric effect of monetary policy over time? A Bayesian analysis using Austrian data," Empirical Economics, Springer, vol. 27(2), pages 277-297.
    24. Jeffrey Frankel, 2007. "On The Rand: Determinants Of The South African Exchange Rate," South African Journal of Economics, Economic Society of South Africa, vol. 75(3), pages 425-441, September.
    25. Hilde C. Bjørnland & Jørn I. Halvorsen, 2014. "How does Monetary Policy Respond to Exchange Rate Movements? New International Evidence," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 76(2), pages 208-232, April.
    26. Hess Chung & Troy Davig & Eric M. Leeper, 2007. "Monetary and Fiscal Policy Switching," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 39(4), pages 809-842, June.
    27. Tae‐Hwan Kim & Stephan Pfaffenzeller & Tony Rayner & Paul Newbold, 2003. "Testing for Linear Trend with Application to Relative Primary Commodity Prices," Journal of Time Series Analysis, Wiley Blackwell, vol. 24(5), pages 539-551, September.
    28. Leeper, Eric M., 1991. "Equilibria under 'active' and 'passive' monetary and fiscal policies," Journal of Monetary Economics, Elsevier, vol. 27(1), pages 129-147, February.
    29. Sylvia Kaufmann, 2000. "Measuring business cycles with a dynamic Markov switching factor model: an assessment using Bayesian simulation methods," Econometrics Journal, Royal Economic Society, vol. 3(1), pages 39-65.
    30. Talvi, Ernesto & Vegh, Carlos A., 2005. "Tax base variability and procyclical fiscal policy in developing countries," Journal of Development Economics, Elsevier, vol. 78(1), pages 156-190, October.
    31. Carmen M. Reinhart & Kenneth S. Rogoff, 2014. "This Time is Different: A Panoramic View of Eight Centuries of Financial Crises," Annals of Economics and Finance, Society for AEF, vol. 15(2), pages 215-268, November.
    32. Lubik, Thomas A. & Schorfheide, Frank, 2007. "Do central banks respond to exchange rate movements? A structural investigation," Journal of Monetary Economics, Elsevier, vol. 54(4), pages 1069-1087, May.
    33. Willi Semmler & Wenlang Zhang, 2004. "Monetary and Fiscal Policy Interactions in the Euro Area," Empirica, Springer;Austrian Institute for Economic Research;Austrian Economic Association, vol. 31(2), pages 205-227, June.
    34. Belke, Ansgar H. & Bordon, Ingo G. & Hendricks, Torben W., 2014. "Monetary policy, global liquidity and commodity price dynamics," The North American Journal of Economics and Finance, Elsevier, vol. 28(C), pages 1-16.
    35. Richard H. Clarida & Jordi Gali & Mark Gertler, 1998. "Monetary policy rules in practice," Proceedings, Federal Reserve Bank of San Francisco, issue Mar.
    36. Reinhart, Carmen & Rogoff, Kenneth, 2009. "This Time It’s Different: Eight Centuries of Financial Folly-Preface," MPRA Paper 17451, University Library of Munich, Germany.
    37. M. S. Mohanty & Marc Klau, 2005. "Monetary Policy Rules in Emerging Market Economies: Issues and Evidence," Springer Books, in: Rolf J. Langhammer & Lúcio Vinhas Souza (ed.), Monetary Policy and Macroeconomic Stabilization in Latin America, pages 205-245, Springer.
    38. Hutchison, Michael M. & Sengupta, Rajeswari & Singh, Nirvikar, 2013. "Dove or Hawk? Characterizing monetary policy regime switches in India," Emerging Markets Review, Elsevier, vol. 16(C), pages 183-202.
    39. Sylvia Fruhwirth-Schnatter, 2004. "Estimating marginal likelihoods for mixture and Markov switching models using bridge sampling techniques," Econometrics Journal, Royal Economic Society, vol. 7(1), pages 143-167, June.
    40. Karlis, Dimitris & Xekalaki, Evdokia, 2003. "Choosing initial values for the EM algorithm for finite mixtures," Computational Statistics & Data Analysis, Elsevier, vol. 41(3-4), pages 577-590, January.
    41. Woodford Michael, 2002. "Inflation Stabilization and Welfare," The B.E. Journal of Macroeconomics, De Gruyter, vol. 2(1), pages 1-53, February.
    42. Jordi Gali & Roberto Perotti, 2003. "Fiscal Policy and Monetary Integration in Europe," NBER Working Papers 9773, National Bureau of Economic Research, Inc.
    43. Ricardo J. Caballero & Emmanuel Farhi & Pierre-Olivier Gourinchas, 2008. "Financial Crash, Commody Prices, and Global Inbalances," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 39(2 (Fall)), pages 1-68.
    44. Svensson, Lars E. O., 2000. "Open-economy inflation targeting," Journal of International Economics, Elsevier, vol. 50(1), pages 155-183, February.
    45. Favero, Carlo A & Rovelli, Riccardo, 2003. "Macroeconomic Stability and the Preferences of the Fed: A Formal Analysis, 1961-98," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 35(4), pages 545-556, August.
    46. Pierre L. Siklos, 2008. "Inflation Targeting Around the World," Emerging Markets Finance and Trade, Taylor & Francis Journals, vol. 44(6), pages 17-37, November.
    47. Assenmacher-Wesche, Katrin, 2006. "Estimating Central Banks' preferences from a time-varying empirical reaction function," European Economic Review, Elsevier, vol. 50(8), pages 1951-1974, November.
    48. Owyang, Michael T. & Ramey, Garey, 2004. "Regime switching and monetary policy measurement," Journal of Monetary Economics, Elsevier, vol. 51(8), pages 1577-1597, November.
    49. Chang-Jin Kim & Charles R. Nelson, 1999. "Has The U.S. Economy Become More Stable? A Bayesian Approach Based On A Markov-Switching Model Of The Business Cycle," The Review of Economics and Statistics, MIT Press, vol. 81(4), pages 608-616, November.
    50. Albert, James H & Chib, Siddhartha, 1993. "Bayes Inference via Gibbs Sampling of Autoregressive Time Series Subject to Markov Mean and Variance Shifts," Journal of Business & Economic Statistics, American Statistical Association, vol. 11(1), pages 1-15, January.
    51. Reinhart, Carmen & Rogoff, Kenneth, 2009. "This Time It’s Different: Eight Centuries of Financial Folly-Chapter 1," MPRA Paper 17452, University Library of Munich, Germany.
    52. José Sidaoui, 2003. "Implications of fiscal issues for central banks. Mexico's experience," BIS Papers chapters, in: Bank for International Settlements (ed.), Fiscal issues and central banking in emerging economies, volume 20, pages 180-197, Bank for International Settlements.
    53. Hegerty, Scott W., 2016. "Commodity-price volatility and macroeconomic spillovers: Evidence from nine emerging markets," The North American Journal of Economics and Finance, Elsevier, vol. 35(C), pages 23-37.
    54. Carmen M. Reinhart & Kenneth S. Rogoff, 2011. "From Financial Crash to Debt Crisis," American Economic Review, American Economic Association, vol. 101(5), pages 1676-1706, August.
    55. David I. Harvey & Neil M. Kellard & Jakob B. Madsen & Mark E. Wohar, 2010. "The Prebisch-Singer Hypothesis: Four Centuries of Evidence," The Review of Economics and Statistics, MIT Press, vol. 92(2), pages 367-377, May.
    56. Janine Aron & John Muellbauer, 2007. "Review of Monetary Policy in South Africa since 1994," Journal of African Economies, Centre for the Study of African Economies, vol. 16(5), pages 705-744, November.
    57. Chib, Siddhartha, 1996. "Calculating posterior distributions and modal estimates in Markov mixture models," Journal of Econometrics, Elsevier, vol. 75(1), pages 79-97, November.
    58. Blanchard, Olivier Jean & Kahn, Charles M, 1980. "The Solution of Linear Difference Models under Rational Expectations," Econometrica, Econometric Society, vol. 48(5), pages 1305-1311, July.
    59. Giorgio Valente, 2003. "Monetary policy rules and regime shifts," Applied Financial Economics, Taylor & Francis Journals, vol. 13(7), pages 525-535.
    60. Matthew Stephens, 2000. "Dealing with label switching in mixture models," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 62(4), pages 795-809.
    61. Hamilton, James D, 1989. "A New Approach to the Economic Analysis of Nonstationary Time Series and the Business Cycle," Econometrica, Econometric Society, vol. 57(2), pages 357-384, March.
    62. Winkelried, Diego, 2016. "Piecewise linear trends and cycles in primary commodity prices," Journal of International Money and Finance, Elsevier, vol. 64(C), pages 196-213.
    63. Sargent, Thomas J., 2014. "The evolution of monetary policy rules," Journal of Economic Dynamics and Control, Elsevier, vol. 49(C), pages 147-150.
    64. Carlo Favero & Tommaso Monacelli, 2005. "Fiscal Policy Rules and Regime (In)Stability: Evidence from the U.S," Working Papers 282, IGIER (Innocenzo Gasparini Institute for Economic Research), Bocconi University.
    65. Sylvia Frühwirth-Schnatter, 2001. "Fully Bayesian Analysis of Switching Gaussian State Space Models," Annals of the Institute of Statistical Mathematics, Springer;The Institute of Statistical Mathematics, vol. 53(1), pages 31-49, March.
    66. Taylor, John B., 1993. "Discretion versus policy rules in practice," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 39(1), pages 195-214, December.
    67. Frankel, Jeffrey A., 2011. "How Can Commodity Exporters Make Fiscal and Monetary Policy Less Procyclical?," Scholarly Articles 4735392, Harvard Kennedy School of Government.
    68. Chib S. & Jeliazkov I., 2001. "Marginal Likelihood From the Metropolis-Hastings Output," Journal of the American Statistical Association, American Statistical Association, vol. 96, pages 270-281, March.
    69. Cevik, Emrah Ismail & Dibooglu, Sel & Kutan, Ali M., 2014. "Monetary and fiscal policy interactions: Evidence from emerging European economies," Journal of Comparative Economics, Elsevier, vol. 42(4), pages 1079-1091.
    70. Chen, Yu-chin & Rogoff, Kenneth, 2003. "Commodity currencies," Journal of International Economics, Elsevier, vol. 60(1), pages 133-160, May.
    71. Jordi Galí & Roberto Perotti, 2003. "Fiscal policy and monetary integration in Europe [‘Consumption smoothing through fiscal policy in OECD and EU countries’]," Economic Policy, CEPR, CESifo, Sciences Po;CES;MSH, vol. 18(37), pages 533-572.
    72. Zheng Liu & Daniel F. Waggoner & Tao Zha, 2011. "Sources of macroeconomic fluctuations: A regime‐switching DSGE approach," Quantitative Economics, Econometric Society, vol. 2(2), pages 251-301, July.
    73. Sachs, Jeffrey D. & Warner, Andrew M., 2001. "The curse of natural resources," European Economic Review, Elsevier, vol. 45(4-6), pages 827-838, May.
    74. Chang-Jin Kim & Charles R. Nelson, 1999. "State-Space Models with Regime Switching: Classical and Gibbs-Sampling Approaches with Applications," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262112388, December.
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