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Catch-Up Growth and Inter-Industry Productivity Spillovers

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  • Bolhuis, Marijn
Abstract
Developing economies tend to export more skill-intensive products as they become more productive. This paper provides a new tractable, quantitative framework to examine the role of inter-industry productivity spillovers in this development process. I start by documenting that a country’s comparative advantage tends to increase in industries that employ occupations that are used most intensively in current exports. In the model, productivity growth is driven by occupation-specific dynamic scale economies, which generate productivity spillovers between occupationally similar sectors. By exploiting cross-sector heterogeneity in foreign demand shocks, I find that dynamic scale economies are substantial in high-skilled production but negligible in low-skilled production. As a result, inter-industry productivity spillovers are larger in richer countries, and access to foreign markets allows developing countries to shift labor into sectors that contribute more to aggregate productivity growth. The model can account for a substantial share of the variation in aggregate and industry-level labor productivity growth across developing economies. Counterfactual exercises suggest that inter-industry spillovers play a quantitatively substantial role in accounting for slow cross-country convergence. Moreover, spillovers increase the gains from trade, especially in developing economies with a comparative advantage in manufacturing.

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  • Bolhuis, Marijn, 2019. "Catch-Up Growth and Inter-Industry Productivity Spillovers," MPRA Paper 94730, University Library of Munich, Germany.
  • Handle: RePEc:pra:mprapa:94730
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    References listed on IDEAS

    as
    1. Jesse Perla & Christopher Tonetti & Michael E. Waugh, 2021. "Equilibrium Technology Diffusion, Trade, and Growth," American Economic Review, American Economic Association, vol. 111(1), pages 73-128, January.
    2. Kiminori Matsuyama, 2019. "Engel's Law in the Global Economy: Demand‐Induced Patterns of Structural Change, Innovation, and Trade," Econometrica, Econometric Society, vol. 87(2), pages 497-528, March.
    3. Claustre Bajona & Timothy Kehoe, 2010. "Trade, Growth, and Convergence in a Dynamic Heckscher-Ohlin Model," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 13(3), pages 487-513, July.
    4. Justin Caron & Thibault Fally & James R. Markusen, 2021. "International Trade Puzzles: A Solution Linking Production And Preferences," World Scientific Book Chapters, in: BROADENING TRADE THEORY Incorporating Market Realities into Traditional Models, chapter 11, pages 199-250, World Scientific Publishing Co. Pte. Ltd..
    5. David Lagakos & Benjamin Moll & Tommaso Porzio & Nancy Qian & Todd Schoellman, 2018. "Life Cycle Wage Growth across Countries," Journal of Political Economy, University of Chicago Press, vol. 126(2), pages 797-849.
    6. Simonovska, Ina & Waugh, Michael E., 2014. "The elasticity of trade: Estimates and evidence," Journal of International Economics, Elsevier, vol. 92(1), pages 34-50.
    7. Sergi Basco & Martí Mestieri, 2019. "The world income distribution: the effects of international unbundling of production," Journal of Economic Growth, Springer, vol. 24(2), pages 189-221, June.
    8. Jonathan Eaton & Robert Dekle & Samuel Kortum, 2007. "Unbalanced Trade," American Economic Review, American Economic Association, vol. 97(2), pages 351-355, May.
    9. Oded Galor & Andrew Mountford, 2006. "Trade and the Great Divergence: The Family Connection," American Economic Review, American Economic Association, vol. 96(2), pages 299-303, May.
    10. Gene M. Grossman & Henrik Horn, 1988. "Infant-Industry Protection Reconsidered: The Case of Informational Barriers to Entry," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 103(4), pages 767-787.
    11. Kevin H. O’Rourke & Ahmed S. Rahman & Alan M. Taylor, 2012. "Trade, Technology and the Great Divergence," Departmental Working Papers 35, United States Naval Academy Department of Economics.
    12. Francisco J Buera & Joseph P Kaboski & Richard Rogerson & Juan I Vizcaino, 2022. "Skill-Biased Structural Change," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 89(2), pages 592-625.
    13. Torben M Andersen, 2015. "Human Capital, Inequality and Growth," European Economy - Discussion Papers 007, Directorate General Economic and Financial Affairs (DG ECFIN), European Commission.
    14. Levchenko, Andrei A. & Zhang, Jing, 2016. "The evolution of comparative advantage: Measurement and welfare implications," Journal of Monetary Economics, Elsevier, vol. 78(C), pages 96-111.
    15. Bahar, Dany & Rosenow, Samuel & Stein, Ernesto & Wagner, Rodrigo, 2019. "Export take-offs and acceleration: Unpacking cross-sector linkages in the evolution of comparative advantage," World Development, Elsevier, vol. 117(C), pages 48-60.
    16. John Romalis, 2004. "Factor Proportions and the Structure of Commodity Trade," American Economic Review, American Economic Association, vol. 94(1), pages 67-97, March.
    17. Ricardo Hausmann & Jason Hwang & Dani Rodrik, 2007. "What you export matters," Journal of Economic Growth, Springer, vol. 12(1), pages 1-25, March.
    18. Daruich, Diego & Easterly, William & Reshef, Ariell, 2019. "The surprising instability of export specializations," Journal of Development Economics, Elsevier, vol. 137(C), pages 36-65.
    19. Dani Rodrik, 2006. "What's So Special about China's Exports?," China & World Economy, Institute of World Economics and Politics, Chinese Academy of Social Sciences, vol. 14(5), pages 1-19, September.
    20. Matsuyama, Kiminori, 1992. "Agricultural productivity, comparative advantage, and economic growth," Journal of Economic Theory, Elsevier, vol. 58(2), pages 317-334, December.
    21. Rodrik, Dani, 2011. "The Future of Convergence," Scholarly Articles 5131504, Harvard Kennedy School of Government.
    22. Theo S. Eicher & David J. Kuenzel, 2016. "The elusive effects of trade on growth: Export diversity and economic take‐off," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 49(1), pages 264-295, February.
    23. Nan Li & Jie Cai, 2015. "Innovation Allocation, Knowledge Composition and Long-Run Growth," 2015 Meeting Papers 1100, Society for Economic Dynamics.
    24. Benjamin F. Jones, 2014. "The Human Capital Stock: A Generalized Approach," American Economic Review, American Economic Association, vol. 104(11), pages 3752-3777, November.
    25. Cai, Jie & Stoyanov, Andrey, 2016. "Population aging and comparative advantage," Journal of International Economics, Elsevier, vol. 102(C), pages 1-21.
    26. David Atkin, 2016. "Endogenous Skill Acquisition and Export Manufacturing in Mexico," American Economic Review, American Economic Association, vol. 106(8), pages 2046-2085, August.
    27. Chor, Davin, 2010. "Unpacking sources of comparative advantage: A quantitative approach," Journal of International Economics, Elsevier, vol. 82(2), pages 152-167, November.
    28. repec:oup:qjecon:v:128:y:2012:i:1:p:165-204 is not listed on IDEAS
    29. Piyabha Kongsamut & Sergio Rebelo & Danyang Xie, 2001. "Beyond Balanced Growth," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 68(4), pages 869-882.
    30. Trevor Tombe, 2015. "The Missing Food Problem: Trade, Agriculture, and International Productivity Differences," American Economic Journal: Macroeconomics, American Economic Association, vol. 7(3), pages 226-258, July.
    31. Mr. Sergio Rebelo & Ms. Piyabha Kongsamut & Danyang Xie, 2001. "Beyond Balanced Growth," IMF Working Papers 2001/085, International Monetary Fund.
    32. Nunn, Nathan & Trefler, Daniel, 2014. "Domestic Institutions as a Source of Comparative Advantage," Handbook of International Economics, in: Gopinath, G. & Helpman, . & Rogoff, K. (ed.), Handbook of International Economics, edition 1, volume 4, chapter 0, pages 263-315, Elsevier.
    33. Krugman, Paul R., 1979. "Increasing returns, monopolistic competition, and international trade," Journal of International Economics, Elsevier, vol. 9(4), pages 469-479, November.
    34. L. Rachel Ngai & Christopher A. Pissarides, 2007. "Structural Change in a Multisector Model of Growth," American Economic Review, American Economic Association, vol. 97(1), pages 429-443, March.
    35. Alwyn Young, 1991. "Learning by Doing and the Dynamic Effects of International Trade," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 106(2), pages 369-405.
    36. Fernando E. Alvarez & Francisco J. Buera & Robert E. Lucas, Jr., 2013. "Idea Flows, Economic Growth, and Trade," NBER Working Papers 19667, National Bureau of Economic Research, Inc.
    37. Robert C. Feenstra & Robert E. Lipsey & Haiyan Deng & Alyson C. Ma & Hengyong Mo, 2005. "World Trade Flows: 1962-2000," NBER Working Papers 11040, National Bureau of Economic Research, Inc.
    38. Frederick van der Ploeg, 2011. "Natural Resources: Curse or Blessing?," Journal of Economic Literature, American Economic Association, vol. 49(2), pages 366-420, June.
    39. Santacreu, Ana Maria, 2015. "Innovation, diffusion, and trade: Theory and measurement," Journal of Monetary Economics, Elsevier, vol. 75(C), pages 1-20.
    40. Ariel Burstein & Eduardo Morales & Jonathan Vogel, 2015. "Accounting for Changes in Between-Group Inequality," NBER Working Papers 20855, National Bureau of Economic Research, Inc.
    41. Costas Arkolakis & Arnaud Costinot & Andres Rodriguez-Clare, 2012. "New Trade Models, Same Old Gains?," American Economic Review, American Economic Association, vol. 102(1), pages 94-130, February.
    42. Krugman, Paul, 1987. "The narrow moving band, the Dutch disease, and the competitive consequences of Mrs. Thatcher : Notes on trade in the presence of dynamic scale economies," Journal of Development Economics, Elsevier, vol. 27(1-2), pages 41-55, October.
    43. Piyabha Kongsamut & Sergio Rebelo & Danyang Xie, 2001. "Beyond Balanced Growth," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 68(4), pages 869-882.
    44. James E. Anderson & Eric van Wincoop, 2003. "Gravity with Gravitas: A Solution to the Border Puzzle," American Economic Review, American Economic Association, vol. 93(1), pages 170-192, March.
    45. Georg Duernecker & Berthold Herrendorf, 2022. "Structural Transformation of Occupation Employment," Economica, London School of Economics and Political Science, vol. 89(356), pages 789-814, October.
    46. Diego Daruich & William Easterly & Ariell Reshef, 2019. "The surprising instability of export specializations," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-02875089, HAL.
    47. Dani Rodrik, 2011. "The future of economic convergence," Proceedings - Economic Policy Symposium - Jackson Hole, Federal Reserve Bank of Kansas City, pages 13-52.
    48. Oded Galor & Andrew Mountford, 2008. "Trading Population for Productivity: Theory and Evidence," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 75(4), pages 1143-1179.
    49. Liuchun Deng, 2016. "Specialization Dynamics, Convergence, and Idea Flows," SERIES 09-2016, Dipartimento di Economia e Finanza - Università degli Studi di Bari "Aldo Moro", revised Nov 2016.
    50. Antonio Ciccone & Elias Papaioannou, 2009. "Human Capital, the Structure of Production, and Growth," The Review of Economics and Statistics, MIT Press, vol. 91(1), pages 66-82, February.
    51. Ricardo Hausmann & César Hidalgo, 2011. "The network structure of economic output," Journal of Economic Growth, Springer, vol. 16(4), pages 309-342, December.
    52. Robert E. Lucas, Jr., 2004. "Life Earnings and Rural-Urban Migration," Journal of Political Economy, University of Chicago Press, vol. 112(S1), pages 29-59, February.
    53. Francesco Caselli & Wilbur John Coleman II, 2006. "The World Technology Frontier," American Economic Review, American Economic Association, vol. 96(3), pages 499-522, June.
    54. Lorenzo Caliendo & Fernando Parro, 2015. "Estimates of the Trade and Welfare Effects of NAFTA," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 82(1), pages 1-44.
    55. Jonathan Eaton & Samuel Kortum, 2002. "Technology, Geography, and Trade," Econometrica, Econometric Society, vol. 70(5), pages 1741-1779, September.
    56. Lucas, Robert Jr., 1988. "On the mechanics of economic development," Journal of Monetary Economics, Elsevier, vol. 22(1), pages 3-42, July.
    57. Feenstra, Robert C., 1996. "Trade and uneven growth," Journal of Development Economics, Elsevier, vol. 49(1), pages 229-256, April.
    58. Robert E. Lucas Jr., 2015. "Human Capital and Growth," American Economic Review, American Economic Association, vol. 105(5), pages 85-88, May.
    59. Cesar A. Hidalgo & Ricardo Hausmann, 2009. "The Building Blocks of Economic Complexity," Papers 0909.3890, arXiv.org.
    60. Keith Head & John Ries, 2001. "Increasing Returns versus National Product Differentiation as an Explanation for the Pattern of U.S.-Canada Trade," American Economic Review, American Economic Association, vol. 91(4), pages 858-876, September.
    61. Eaton, Jonathan & Kortum, Samuel, 2001. "Technology, trade, and growth: A unified framework," European Economic Review, Elsevier, vol. 45(4-6), pages 742-755, May.
    62. repec:hoo:wpaper:e-92-3 is not listed on IDEAS
    63. Hanson, Gordon H. & Lind, Nelson & Muendler, Marc-Andreas, 2015. "The Dynamics of Comparative Advantage," CAGE Online Working Paper Series 252, Competitive Advantage in the Global Economy (CAGE).
    64. Dani Rodrik, 2006. "What’s So Special about China’s Exports?," Working Papers id:410, eSocialSciences.
    65. Redding, Stephen, 1999. "Dynamic Comparative Advantage and the Welfare Effects of Trade," Oxford Economic Papers, Oxford University Press, vol. 51(1), pages 15-39, January.
    66. Trefler, Daniel, 1993. "International Factor Price Differences: Leontief Was Right!," Journal of Political Economy, University of Chicago Press, vol. 101(6), pages 961-987, December.
    67. Peter M. Morrow & Daniel Trefler, 2017. "Endowments, Skill-Biased Technology, and Factor Prices: A Unified Approach to Trade," NBER Working Papers 24078, National Bureau of Economic Research, Inc.
    68. C. A. Hidalgo & B. Klinger & A. -L. Barabasi & R. Hausmann, 2007. "The Product Space Conditions the Development of Nations," Papers 0708.2090, arXiv.org.
    69. Federico Rossi, 2019. "The Relative Efficiency of Skilled Labor across Countries: Measurement and Interpretation," 2019 Meeting Papers 829, Society for Economic Dynamics.
    70. Nancy L. Stokey, 1991. "Human Capital, Product Quality, and Growth," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 106(2), pages 587-616.
    71. Alwyn Young, 1991. "Learning by Doing and the Dynamic Effects of International Trade," NBER Working Papers 3577, National Bureau of Economic Research, Inc.
    72. Unjung Whang, 2017. "Structural Transformation and Comparative Advantage: Implications for Small Open Economies," The World Economy, Wiley Blackwell, vol. 40(4), pages 743-763, April.
    73. Trefler, Daniel, 1995. "The Case of the Missing Trade and Other Mysteries," American Economic Review, American Economic Association, vol. 85(5), pages 1029-1046, December.
    74. Krugman, Paul, 1981. "Trade, accumulation, and uneven development," Journal of Development Economics, Elsevier, vol. 8(2), pages 149-161, April.
    75. Peter K. Schott, 2008. "The relative sophistication of Chinese exports [‘Manufacturing Earnings and Compensation in China’]," Economic Policy, CEPR, CESifo, Sciences Po;CES;MSH, vol. 23(53), pages 6-49.
    76. Blanchard, Emily J. & Olney, William W., 2017. "Globalization and human capital investment: Export composition drives educational attainment," Journal of International Economics, Elsevier, vol. 106(C), pages 165-183.
    77. Mariano A. Somale, 2017. "Comparative Advantage in Innovation and Production," International Finance Discussion Papers 1206, Board of Governors of the Federal Reserve System (U.S.).
    78. Jonathan Eaton & Samuel S. Kortum & Sebastian Sotelo, 2012. "International Trade: Linking Micro and Macro," NBER Working Papers 17864, National Bureau of Economic Research, Inc.
    79. Gordon H. Hanson, 2017. "What Do We Really Know about Offshoring? Industries and Countries in Global Production Sharing," Development Working Papers 416, Centro Studi Luca d'Agliano, University of Milano.
    80. Richard Rogerson & Joseph Kaboski & Francisco Buera, 2015. "Skill-Biased Structural Change and the Skill Premium," 2015 Meeting Papers 895, Society for Economic Dynamics.
    81. Martin Fiszbein, 2017. "Agricultural Diversity, Structural Change and Long-run Development: Evidence from the U.S," NBER Working Papers 23183, National Bureau of Economic Research, Inc.
    82. Ronald U. Mendoza, 2010. "Trade-induced Learning and Industrial Catch-up," Economic Journal, Royal Economic Society, vol. 120(546), pages 313-350, August.
    83. repec:fth:bosecd:110 is not listed on IDEAS
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    More about this item

    Keywords

    Productivity; Convergence; Spillovers; Dynamic scale economies; Comparative advantage; Exports;
    All these keywords.

    JEL classification:

    • F1 - International Economics - - Trade
    • F4 - International Economics - - Macroeconomic Aspects of International Trade and Finance
    • F6 - International Economics - - Economic Impacts of Globalization
    • O1 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development
    • O3 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights
    • O4 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity

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