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The Nonlinear Effects of Oil Rent Dependence on Malaysian Manufacturing: Implications from Structural Change using a Markov-Regime Switching Model

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Abstract
Previous “oil curse” studies primarily estimate a single, linear effect of oil rents on income using time-invariant parameters over entire sample periods. This means the true effects of oil dependence cannot be captured if structural changes are taking place, or effects are nonlinear. We introduce a two regime Markov-switching model into the resource effects literature to assess the time-varying effects of oil rent dependence on the Malaysian manufacturing sector. We also allow for non-linear threshold effects. We find the impact of oil rents is regimedependent. Under a rarer “first regime” structure there is no significant effect. Under a predominant “second regime” there is an inverted U-shaped effect, with oil rents’ share of GDP up to 8% positively associated with manufacturing, and negatively associated beyond this. We find connections between regime changes and the 1997 Asian financial crisis and 2008 global financial crisis. Implications for effective diversification policies are discussed.

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  • Ramez Abubakr Badeeb & Jeremy Clark & Abey P. Philip, 2021. "The Nonlinear Effects of Oil Rent Dependence on Malaysian Manufacturing: Implications from Structural Change using a Markov-Regime Switching Model," Working Papers in Economics 21/11, University of Canterbury, Department of Economics and Finance.
    • Handle: RePEc:cbt:econwp:21/11
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    1. Brunnschweiler, Christa N. & Bulte, Erwin H., 2008. "The resource curse revisited and revised: A tale of paradoxes and red herrings," Journal of Environmental Economics and Management, Elsevier, vol. 55(3), pages 248-264, May.
    2. Rabah Arezki & Frederick van der Ploeg, 2010. "Trade policies, institutions and the natural resource curse," Applied Economics Letters, Taylor & Francis Journals, vol. 17(15), pages 1443-1451.
    3. Bhattacharyya, Sambit & Hodler, Roland, 2010. "Natural resources, democracy and corruption," European Economic Review, Elsevier, vol. 54(4), pages 608-621, May.
    4. Rabah Arezki & Mustapha K. Nabli, 2012. "Natural Resources, Volatility, and Inclusive Growth: Perspectives from the Middle East and North Africa," OxCarre Working Papers 086, Oxford Centre for the Analysis of Resource Rich Economies, University of Oxford.
    5. Berg, Andrew & Ostry, Jonathan D. & Zettelmeyer, Jeromin, 2012. "What makes growth sustained?," Journal of Development Economics, Elsevier, vol. 98(2), pages 149-166.
    6. Chkili, Walid & Nguyen, Duc Khuong, 2014. "Exchange rate movements and stock market returns in a regime-switching environment: Evidence for BRICS countries," Research in International Business and Finance, Elsevier, vol. 31(C), pages 46-56.
    7. Tsani, Stella, 2013. "Natural resources, governance and institutional quality: The role of resource funds," Resources Policy, Elsevier, vol. 38(2), pages 181-195.
    8. Jeffrey D. Sachs & Andrew M. Warner, 1995. "Natural Resource Abundance and Economic Growth," NBER Working Papers 5398, National Bureau of Economic Research, Inc.
    9. Majumder, Monoj Kumar & Raghavan, Mala & Vespignani, Joaquin, 2020. "Oil curse, economic growth and trade openness," Energy Economics, Elsevier, vol. 91(C).
    10. Xavier Sala-i-Martin & Arvind Subramanian, 2013. "Addressing the Natural Resource Curse: An Illustration from Nigeria," Journal of African Economies, Centre for the Study of African Economies, vol. 22(4), pages 570-615, August.
    11. Katsuya Ito, 2017. "Dutch disease and Russia," International Economics, CEPII research center, issue 151, pages 66-70.
    12. Ricardo Hausmann & Jason Hwang & Dani Rodrik, 2007. "What you export matters," Journal of Economic Growth, Springer, vol. 12(1), pages 1-25, March.
    13. Ampofo, Gideon Kwaku Minua & Cheng, Jinhua & Asante, Daniel Akwasi & Bosah, Philip, 2020. "Total natural resource rents, trade openness and economic growth in the top mineral-rich countries: New evidence from nonlinear and asymmetric analysis," Resources Policy, Elsevier, vol. 68(C).
    14. Badeeb, Ramez Abubakr & Lean, Hooi Hooi & Smyth, Russell, 2016. "Oil curse and finance–growth nexus in Malaysia: The role of investment," Energy Economics, Elsevier, vol. 57(C), pages 154-165.
    15. Mehrara, Mohsen, 2009. "Reconsidering the resource curse in oil-exporting countries," Energy Policy, Elsevier, vol. 37(3), pages 1165-1169, March.
    16. Jarreau, Joachim & Poncet, Sandra, 2012. "Export sophistication and economic growth: Evidence from China," Journal of Development Economics, Elsevier, vol. 97(2), pages 281-292.
    17. Gylfason, Thorvaldur, 2001. "Natural resources, education, and economic development," European Economic Review, Elsevier, vol. 45(4-6), pages 847-859, May.
    18. Shahbaz, Muhammad & Destek, Mehmet Akif & Okumus, Ilyas & Sinha, Avik, 2019. "An empirical note on comparison between resource abundance and resource dependence in resource abundant countries," Resources Policy, Elsevier, vol. 60(C), pages 47-55.
    19. Badeeb, Ramez Abubakr & Lean, Hooi Hooi & Clark, Jeremy, 2017. "The evolution of the natural resource curse thesis: A critical literature survey," Resources Policy, Elsevier, vol. 51(C), pages 123-134.
    20. repec:hal:pseose:hal-00649282 is not listed on IDEAS
    21. Adams, Dawda & Adams, Kweku & Ullah, Subhan & Ullah, Farid, 2019. "Globalisation, governance, accountability and the natural resource ‘curse’: Implications for socio-economic growth of oil-rich developing countries," Resources Policy, Elsevier, vol. 61(C), pages 128-140.
    22. Engle, Robert & Granger, Clive, 2015. "Co-integration and error correction: Representation, estimation, and testing," Applied Econometrics, Russian Presidential Academy of National Economy and Public Administration (RANEPA), vol. 39(3), pages 106-135.
    23. Thorvaldur Gylfason & Gylfi Zoega, 2006. "Natural Resources and Economic Growth: The Role of Investment," The World Economy, Wiley Blackwell, vol. 29(8), pages 1091-1115, August.
    24. Corden, W M, 1984. "Booming Sector and Dutch Disease Economics: Survey and Consolidation," Oxford Economic Papers, Oxford University Press, vol. 36(3), pages 359-380, November.
    25. Frederick van der Ploeg, 2011. "Natural Resources: Curse or Blessing?," Journal of Economic Literature, American Economic Association, vol. 49(2), pages 366-420, June.
    26. Clemente, Jesus & Montanes, Antonio & Reyes, Marcelo, 1998. "Testing for a unit root in variables with a double change in the mean," Economics Letters, Elsevier, vol. 59(2), pages 175-182, May.
    27. Shahbaz, Muhammad & Zakaria, Muhammad & Shahzad, Syed Jawad Hussain & Mahalik, Mantu Kumar, 2018. "The energy consumption and economic growth nexus in top ten energy-consuming countries: Fresh evidence from using the quantile-on-quantile approach," Energy Economics, Elsevier, vol. 71(C), pages 282-301.
    28. Frederick van der Ploeg & Steven Poelhekke, 2009. "Volatility and the natural resource curse," Oxford Economic Papers, Oxford University Press, vol. 61(4), pages 727-760, October.
    29. Walid, Chkili & Chaker, Aloui & Masood, Omar & Fry, John, 2011. "Stock market volatility and exchange rates in emerging countries: A Markov-state switching approach," Emerging Markets Review, Elsevier, vol. 12(3), pages 272-292, September.
    30. Frankel, Jeffrey A., 2010. "The Natural Resource Curse: A Survey," Scholarly Articles 4454156, Harvard Kennedy School of Government.
    31. Hilmawan, Rian & Clark, Jeremy, 2021. "Resource dependence and the causes of local economic growth: An empirical investigation," Australian Journal of Agricultural and Resource Economics, Australian Agricultural and Resource Economics Society, vol. 65(03), January.
    32. Gregory, Allan W. & Hansen, Bruce E., 1996. "Residual-based tests for cointegration in models with regime shifts," Journal of Econometrics, Elsevier, vol. 70(1), pages 99-126, January.
    33. Sachs, Jeffrey D & Warner, Andrew M, 1997. "Fundamental Sources of Long-Run Growth," American Economic Review, American Economic Association, vol. 87(2), pages 184-188, May.
    34. Amiri, Hossein & Samadian, Farzaneh & Yahoo, Masoud & Jamali, Seyed Jafar, 2019. "Natural resource abundance, institutional quality and manufacturing development: Evidence from resource-rich countries," Resources Policy, Elsevier, vol. 62(C), pages 550-560.
    35. Peter Boswijk, H., 1994. "Testing for an unstable root in conditional and structural error correction models," Journal of Econometrics, Elsevier, vol. 63(1), pages 37-60, July.
    36. James, Alexander, 2015. "The resource curse: A statistical mirage?," Journal of Development Economics, Elsevier, vol. 114(C), pages 55-63.
    37. Tiba, Sofien & Frikha, Mohamed, 2019. "The controversy of the resource curse and the environment in the SDGs background: The African context," Resources Policy, Elsevier, vol. 62(C), pages 437-452.
    38. Shahbaz, Muhammad & Ahmed, Khalid & Tiwari, Aviral Kumar & Jiao, Zhilun, 2019. "Resource curse hypothesis and role of oil prices in USA," Resources Policy, Elsevier, vol. 64(C).
    39. Johansen, Soren, 1991. "Estimation and Hypothesis Testing of Cointegration Vectors in Gaussian Vector Autoregressive Models," Econometrica, Econometric Society, vol. 59(6), pages 1551-1580, November.
    40. Thorvaldur Gylfason, 2006. "Natural Resources and Economic Growth: From Dependence to Diversification," Springer Books, in: Harry G. Broadman & Tiiu Paas & Paul J.J. Welfens (ed.), Economic Liberalization and Integration Policy, pages 201-231, Springer.
    41. Mansor H. Ibrahim, 2000. "Public And Private Capital Formation And Economic Growth In Malaysia, 1961-1995," IIUM Journal of Economics and Management, IIUM Journal of Economis and Management, vol. 8(1), pages 21-40, June.
    42. Ang, James B. & McKibbin, Warwick J., 2007. "Financial liberalization, financial sector development and growth: Evidence from Malaysia," Journal of Development Economics, Elsevier, vol. 84(1), pages 215-233, September.
    43. Inglesi-Lotz, Roula, 2016. "The impact of renewable energy consumption to economic growth: A panel data application," Energy Economics, Elsevier, vol. 53(C), pages 58-63.
    44. Ito, Katsuya, 2017. "Dutch disease and Russia," International Economics, Elsevier, vol. 151(C), pages 66-70.
    45. Bhattacharyya, Sambit & Hodler, Roland, 2014. "Do Natural Resource Revenues Hinder Financial Development? The Role of Political Institutions," World Development, Elsevier, vol. 57(C), pages 101-113.
    46. Stijns, Jean-Philippe C., 2005. "Natural resource abundance and economic growth revisited," Resources Policy, Elsevier, vol. 30(2), pages 107-130, June.
    47. Estrades, Carmen & Llambí, Cecilia & Perera, Marcelo & Rovira, Flavia, 2016. "Large-scale mining in a small developing country: Macroeconomic impacts of revenue allocation policies," Resources Policy, Elsevier, vol. 49(C), pages 433-443.
    48. Doraisami, Anita, 2015. "Has Malaysia really escaped the resource curse? A closer look at the political economy of oil revenue management and expenditures," Resources Policy, Elsevier, vol. 45(C), pages 98-108.
    49. Charfeddine, Lanouar, 2017. "The impact of energy consumption and economic development on Ecological Footprint and CO2 emissions: Evidence from a Markov Switching Equilibrium Correction Model," Energy Economics, Elsevier, vol. 65(C), pages 355-374.
    50. Dong, Baomin & Zhang, Yu & Song, Huasheng, 2019. "Corruption as a natural resource curse: Evidence from the Chinese coal mining," China Economic Review, Elsevier, vol. 57(C).
    51. Doğan, İbrahim & Bilgili, Faik, 2014. "The non-linear impact of high and growing government external debt on economic growth: A Markov Regime-switching approach," Economic Modelling, Elsevier, vol. 39(C), pages 213-220.
    52. Mallick, Hrushikesh & Mahalik, Mantu Kumar & Sahoo, Manoranjan, 2018. "Is crude oil price detrimental to domestic private investment for an emerging economy? The role of public sector investment and financial sector development in an era of globalization," Energy Economics, Elsevier, vol. 69(C), pages 307-324.
    53. Perron, Pierre, 1989. "The Great Crash, the Oil Price Shock, and the Unit Root Hypothesis," Econometrica, Econometric Society, vol. 57(6), pages 1361-1401, November.
    54. Abdulahi, Mohamued Elyas & Shu, Yang & Khan, Muhammad Asif, 2019. "Resource rents, economic growth, and the role of institutional quality: A panel threshold analysis," Resources Policy, Elsevier, vol. 61(C), pages 293-303.
    55. Menon, Jayant, 2012. "Malaysia’s Investment Malaise: What Happened and Can It Be Fixed?," ADB Economics Working Paper Series 312, Asian Development Bank.
    56. Damette, Olivier & Seghir, Majda, 2018. "Natural resource curse in oil exporting countries: A nonlinear approach," International Economics, Elsevier, vol. 156(C), pages 231-246.
    57. Bhar, Ramaprasad & Hammoudeh, Shawkat, 2011. "Commodities and financial variables: Analyzing relationships in a changing regime environment," International Review of Economics & Finance, Elsevier, vol. 20(4), pages 469-484, October.
    58. Corden, W Max & Neary, J Peter, 1982. "Booming Sector and De-Industrialisation in a Small Open Economy," Economic Journal, Royal Economic Society, vol. 92(368), pages 825-848, December.
    59. Elissaios Papyrakis & Ohad Raveh, 2014. "An Empirical Analysis of a Regional Dutch Disease: The Case of Canada," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 58(2), pages 179-198, June.
    60. Pan, Xiongfeng & Uddin, Md. Kamal & Saima, Umme & Guo, Shucen & Guo, Ranran, 2019. "Regime switching effect of financial development on energy intensity: Evidence from Markov-switching vector error correction model," Energy Policy, Elsevier, vol. 135(C).
    61. Gregory, Allan W & Hansen, Bruce E, 1996. "Tests for Cointegration in Models with Regime and Trend Shifts," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 58(3), pages 555-560, August.
    62. Christian Bayer & Christoph Hanck, 2013. "Combining non-cointegration tests," Journal of Time Series Analysis, Wiley Blackwell, vol. 34(1), pages 83-95, January.
    63. Apergis, Nicholas & Cooray, Arusha & Khraief, Naceur & Apergis, Iraklis, 2019. "Do gold prices respond to real interest rates? Evidence from the Bayesian Markov Switching VECM model," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 60(C), pages 134-148.
    64. Michael Alexeev & Robert Conrad, 2009. "The Elusive Curse of Oil," The Review of Economics and Statistics, MIT Press, vol. 91(3), pages 586-598, August.
    65. William F. Maloney & Daniel Lederman, 2008. "In search of the Missing Resource Curse," Economía Journal, The Latin American and Caribbean Economic Association - LACEA, vol. 0(Fall 2008), pages 1-57, August.
    66. Atsushi Iimi, 2007. "Escaping from the Resource Curse: Evidence from Botswana and the Rest of the World," IMF Staff Papers, Palgrave Macmillan, vol. 54(4), pages 663-699, November.
    67. Papyrakis, Elissaios & Gerlagh, Reyer, 2006. "Resource windfalls, investment, and long-term income," Resources Policy, Elsevier, vol. 31(2), pages 117-128, June.
    68. Rahman, Abdul & Khan, Muhammad Arshad & Charfeddine, Lanouar, 2021. "Regime-specific impact of financial reforms on economic growth in Pakistan," Journal of Policy Modeling, Elsevier, vol. 43(1), pages 161-182.
    69. Chica-Olmo, Jorge & Sari-Hassoun, Salaheddine & Moya-Fernández, Pablo, 2020. "Spatial relationship between economic growth and renewable energy consumption in 26 European countries," Energy Economics, Elsevier, vol. 92(C).
    70. Alexandre Henry, 2019. "Transmission channels of the resource curse in Africa : A time perspective," Post-Print hal-03488691, HAL.
    71. Adams, Dawda & Ullah, Subhan & Akhtar, Pervaiz & Adams, Kweku & Saidi, Samir, 2019. "The role of country-level institutional factors in escaping the natural resource curse: Insights from Ghana," Resources Policy, Elsevier, vol. 61(C), pages 433-440.
    72. Henry, Alexandre, 2019. "Transmission channels of the resource curse in Africa: A time perspective," Economic Modelling, Elsevier, vol. 82(C), pages 13-20.
    73. Bulte, Erwin H. & Damania, Richard & Deacon, Robert T., 2005. "Resource intensity, institutions, and development," World Development, Elsevier, vol. 33(7), pages 1029-1044, July.
    74. Farhadi, Minoo & Islam, Md. Rabiul & Moslehi, Solmaz, 2015. "Economic Freedom and Productivity Growth in Resource-rich Economies," World Development, Elsevier, vol. 72(C), pages 109-126.
    75. Sachs, Jeffrey D. & Warner, Andrew M., 2001. "The curse of natural resources," European Economic Review, Elsevier, vol. 45(4-6), pages 827-838, May.
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    Keywords

    Oil curse; Oil rent; Markov Switching Model; Manufacturing sector; Malaysia;
    All these keywords.

    JEL classification:

    • C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes
    • O11 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Macroeconomic Analyses of Economic Development
    • O13 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Agriculture; Natural Resources; Environment; Other Primary Products
    • Q33 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Nonrenewable Resources and Conservation - - - Resource Booms (Dutch Disease)

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