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The returns to occupation-specific human capital - Evidence from mobility after training

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  • Barbara Mueller

    (Swiss Federal Institute for Vocational Education and Training (SFIVET))

  • Juerg Schweri

    (Swiss Federal Institute for Vocational Education and Training (SFIVET))

Abstract

Using a longitudinal dataset based on the PISA 2000 survey, we analyze the effect of inter-firm and occupational mobility on post-training wages in Switzerland to assess the transferability of the human capital acquired in training. We show that OLS provides a lower bound estimate of the wage effects of inter-firm and occupational mobility. Inter-firm mobility has no significant wage effect in OLS regressions. However, those who stay in their occupational field earn about 5 percent more than their colleagues who change occupation. We find no evidence for adverse selection when accounting only for apprentices’ level of ability. Accounting for the endogeneity of mobility tends to increase the estimated wage differential between occupation stayers and changers, but not between firm stayers and movers. We conclude that occupation-specific human capital is an important component of apprenticeship training and accounts for a part of the returns to training.

Suggested Citation

  • Barbara Mueller & Juerg Schweri, 2012. "The returns to occupation-specific human capital - Evidence from mobility after training," Economics of Education Working Paper Series 0081, University of Zurich, Department of Business Administration (IBW).
  • Handle: RePEc:iso:educat:0081
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    1. Bassanini, Andrea & Brunello, Giorgio, 2007. "Barriers to Entry, Deregulation and Workplace Training," IZA Discussion Papers 2746, Institute of Labor Economics (IZA).
    2. Spiros Bougheas & Yannis Georgellis, 2004. "Early Career Mobility and Earnings Profiles of German Apprentices: Theory and Empirical Evidence," LABOUR, CEIS, vol. 18(2), pages 233-263, June.
    3. Gueorgui Kambourov & Iourii Manovskii, 2009. "Occupational Specificity Of Human Capital," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 50(1), pages 63-115, February.
    4. Wolter, Stefan C. & Ryan, Paul, 2011. "Apprenticeship," Handbook of the Economics of Education, in: Erik Hanushek & Stephen Machin & Ludger Woessmann (ed.), Handbook of the Economics of Education, edition 1, volume 3, chapter 11, pages 521-576, Elsevier.
    5. Margaret Stevens, 2003. "Earnings Functions, Specific Human Capital, and Job Matching: Tenure Bias Is Negative," Journal of Labor Economics, University of Chicago Press, vol. 21(4), pages 783-806, October.
    6. Longhi, Simonetta & Brynin, Malcolm, 2010. "Occupational change in Britain and Germany," Labour Economics, Elsevier, vol. 17(4), pages 655-666, August.
    7. Gibbons, Robert & Katz, Lawrence F, 1991. "Layoffs and Lemons," Journal of Labor Economics, University of Chicago Press, vol. 9(4), pages 351-380, October.
    8. Vella, Francis & Verbeek, Marno, 1999. "Estimating and Interpreting Models with Endogenous Treatment Effects," Journal of Business & Economic Statistics, American Statistical Association, vol. 17(4), pages 473-478, October.
    9. Christian Dustmann & Costas Meghir, 2005. "Wages, Experience and Seniority," Review of Economic Studies, Oxford University Press, vol. 72(1), pages 77-108.
    10. Daron Acemoglu & Jörn-Steffen Pischke, 1998. "Why Do Firms Train? Theory and Evidence," The Quarterly Journal of Economics, Oxford University Press, vol. 113(1), pages 79-119.
    11. Thomas J. Kane & Dietmar Harhoff, 1997. "Is the German apprenticeship system a panacea for the U.S. labor market?," Journal of Population Economics, Springer;European Society for Population Economics, vol. 10(2), pages 171-196.
    12. François Bourguignon & Martin Fournier & Marc Gurgand, 2004. "Selection Bias Corrections Based on the Multinomial Logit Model: Monte-Carlo Comparisons," DELTA Working Papers 2004-20, DELTA (Ecole normale supérieure).
    13. Christina Gathmann & Uta Schönberg, 2010. "How General Is Human Capital? A Task-Based Approach," Journal of Labor Economics, University of Chicago Press, vol. 28(1), pages 1-49, January.
    14. Hashimoto, Masanori, 1981. "Firm-Specific Human Capital as a Shared Investment," American Economic Review, American Economic Association, vol. 71(3), pages 475-482, June.
    15. Regula Geel & Johannes Mure & Uschi Backes-Gellner, 2011. "Specificity of occupational training and occupational mobility: an empirical study based on Lazear’s skill-weights approach," Education Economics, Taylor & Francis Journals, vol. 19(5), pages 519-535, January.
    16. Edward P. Lazear, 2009. "Firm-Specific Human Capital: A Skill-Weights Approach," Journal of Political Economy, University of Chicago Press, vol. 117(5), pages 914-940, October.
    17. Kathrin Göggel & Thomas Zwick, 2012. "Heterogeneous Wage Effects of Apprenticeship Training," Scandinavian Journal of Economics, Wiley Blackwell, vol. 114(3), pages 756-779, September.
    18. Fitzenberger, Bernd & Licklederer, Stefanie & Zwiener, Hanna, 2015. "Mobility across firms and occupations among graduates from apprenticeship," Labour Economics, Elsevier, vol. 34(C), pages 138-151.
    19. Beatrice Brunner & Andreas Kuhn, 2014. "The impact of labor market entry conditions on initial job assignment and wages," Journal of Population Economics, Springer;European Society for Population Economics, vol. 27(3), pages 705-738, July.
    20. Partha Deb & Pravin K. Trivedi, 2006. "Specification and simulated likelihood estimation of a non-normal treatment-outcome model with selection: Application to health care utilization," Econometrics Journal, Royal Economic Society, vol. 9(2), pages 307-331, July.
    21. Werwatz, A., 1996. "How firm-specific is German apprenticeship training?," SFB 373 Discussion Papers 1996,12, Humboldt University of Berlin, Interdisciplinary Research Project 373: Quantification and Simulation of Economic Processes.
    22. Giuseppe Moscarini & Kaj Thomsson, 2007. "Occupational and Job Mobility in the US," Scandinavian Journal of Economics, Wiley Blackwell, vol. 109(4), pages 807-836, December.
    23. Lamo, Ana & Messina, Julián & Wasmer, Etienne, 2011. "Are specific skills an obstacle to labor market adjustment?," Labour Economics, Elsevier, vol. 18(2), pages 240-256, April.
    24. Jovanovic, Boyan, 1979. "Job Matching and the Theory of Turnover," Journal of Political Economy, University of Chicago Press, vol. 87(5), pages 972-990, October.
    25. Etienne Wasmer, 2006. "General versus Specific Skills in Labor Markets with Search Frictions and Firing Costs," American Economic Review, American Economic Association, vol. 96(3), pages 811-831, June.
    26. Stefan C. Wolter & Samuel Mühlemann & Jürg Schweri, 2006. "Why Some Firms Train Apprentices and Many Others Do Not," German Economic Review, Verein für Socialpolitik, vol. 7(3), pages 249-264, August.
    27. Lee, Lung-Fei, 1983. "Generalized Econometric Models with Selectivity," Econometrica, Econometric Society, vol. 51(2), pages 507-512, March.
    28. Parrado, Eric & Caner, Asena & Wolff, Edward N., 2007. "Occupational and industrial mobility in the United States," Labour Economics, Elsevier, vol. 14(3), pages 435-455, June.
    29. Stevens, Margaret, 1994. "A Theoretical Model of On-the-Job Training with Imperfect Competition," Oxford Economic Papers, Oxford University Press, vol. 46(4), pages 537-562, October.
    30. Alexandros Zangelidis, 2008. "Occupational And Industry Specificity Of Human Capital In The British Labour Market," Scottish Journal of Political Economy, Scottish Economic Society, vol. 55(4), pages 420-443, September.
    31. Paul Sullivan, 2009. "Estimation of an Occupational Choice Model when Occupations are Misclassified," Journal of Human Resources, University of Wisconsin Press, vol. 44(2).
    32. Sullivan, Paul, 2010. "Empirical evidence on occupation and industry specific human capital," Labour Economics, Elsevier, vol. 17(3), pages 567-580, June.
    33. Heckman, James J, 1978. "Dummy Endogenous Variables in a Simultaneous Equation System," Econometrica, Econometric Society, vol. 46(4), pages 931-959, July.
    34. Kathrin Bertschy & M. Alejandra Cattaneo & Stefan C. Wolter, 2009. "PISA and the Transition into the Labour Market," LABOUR, CEIS, vol. 23(s1), pages 111-137, March.
    35. Malcomson, James M. & Maw, James W. & McCormick, Barry, 2003. "General training by firms, apprentice contracts, and public policy," European Economic Review, Elsevier, vol. 47(2), pages 197-227, April.
    36. Gordon B. Dahl, 2002. "Mobility and the Return to Education: Testing a Roy Model with Multiple Markets," Econometrica, Econometric Society, vol. 70(6), pages 2367-2420, November.
    37. Samuel Muehlemann & Paul Ryan & Stefan C. Wolter, 2013. "Monopsony Power, Pay Structure, and Training," ILR Review, Cornell University, ILR School, vol. 66(5), pages 1097-1114, October.
    38. Dubin, Jeffrey A & McFadden, Daniel L, 1984. "An Econometric Analysis of Residential Electric Appliance Holdings and Consumption," Econometrica, Econometric Society, vol. 52(2), pages 345-362, March.
    39. Gary S. Becker, 1962. "Investment in Human Capital: A Theoretical Analysis," NBER Chapters, in: Investment in Human Beings, pages 9-49, National Bureau of Economic Research, Inc.
    40. repec:bdp:wpaper:2015001 is not listed on IDEAS
    41. Muehlemann, Samuel & Pfeifer, Harald & Walden, Günter & Wenzelmann, Felix & Wolter, Stefan C., 2010. "The financing of apprenticeship training in the light of labor market regulations," Labour Economics, Elsevier, vol. 17(5), pages 799-809, October.
    42. Stefan Bender & Till von Wachter, 2006. "In the Right Place at the Wrong Time: The Role of Firms and Luck in Young Workers' Careers," American Economic Review, American Economic Association, vol. 96(5), pages 1679-1705, December.
    43. Neal, Derek, 1995. "Industry-Specific Human Capital: Evidence from Displaced Workers," Journal of Labor Economics, University of Chicago Press, vol. 13(4), pages 653-677, October.
    44. Margaret Stevens, 2004. "Wage-Tenure Contracts in a Frictional Labour Market: Firms' Strategies for Recruitment and Retention," Review of Economic Studies, Oxford University Press, vol. 71(2), pages 535-551.
    45. Bernd Fitzenberger & Astrid Kunze, 2005. "Vocational Training and Gender: Wages and Occupational Mobility among Young Workers," Oxford Review of Economic Policy, Oxford University Press, vol. 21(3), pages 392-415, Autumn.
    46. Francis Vella, 1998. "Estimating Models with Sample Selection Bias: A Survey," Journal of Human Resources, University of Wisconsin Press, vol. 33(1), pages 127-169.
    47. Regula Geel & Uschi Backes-Gellner, 2009. "Occupational Mobility Within and Between Skill Clusters: An Empirical Analysis Based on the Skill-Weights Approach," Economics of Education Working Paper Series 0047, University of Zurich, Department of Business Administration (IBW), revised Mar 2011.
    48. Hessel Oosterbeek & Edwin Leuven, 2001. "Firm-Specific Human Capital as a Shared Investment: Comment," American Economic Review, American Economic Association, vol. 91(1), pages 342-347, March.
    49. Lalé, Etienne, 2012. "Trends in occupational mobility in France: 1982–2009," Labour Economics, Elsevier, vol. 19(3), pages 373-387.
    50. Rainer Winkelmann, 1996. "Employment Prospects and Skill Acquisition of Apprenticeship-Trained Workers in Germany," ILR Review, Cornell University, ILR School, vol. 49(4), pages 658-672, July.
    51. Bassanini, Andrea & Booth, Alison L. & Brunello, Giorgio & De Paola, Maria & Leuven, Edwin, 2005. "Workplace Training in Europe," IZA Discussion Papers 1640, Institute of Labor Economics (IZA).
    52. Werwatz, A., 1997. "Mobility after Apprenticeship- How effective is the German apprenticeship system?," SFB 373 Discussion Papers 1997,75, Humboldt University of Berlin, Interdisciplinary Research Project 373: Quantification and Simulation of Economic Processes.
    53. Gueorgui Kambourov & Iourii Manovskii, 2008. "Rising Occupational And Industry Mobility In The United States: 1968-97," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 49(1), pages 41-79, February.
    54. Christian Dustmann & Uta Schoenberg, 2007. "Apprenticeship Training and Commitment to Training Provision," Economics of Education Working Paper Series 0032, University of Zurich, Department of Business Administration (IBW).
    55. Parent, Daniel, 2000. "Industry-Specific Capital and the Wage Profile: Evidence from the National Longitudinal Survey of Youth and the Panel Study of Income Dynamics," Journal of Labor Economics, University of Chicago Press, vol. 18(2), pages 306-323, April.
    56. Smits, W., 2007. "Industry-specific or generic skills? Conflicting interests of firms and workers," Labour Economics, Elsevier, vol. 14(3), pages 653-663, June.
    57. François Bourguignon & Martin Fournier & Marc Gurgand, 2007. "Selection Bias Corrections Based On The Multinomial Logit Model: Monte Carlo Comparisons," Journal of Economic Surveys, Wiley Blackwell, vol. 21(1), pages 174-205, February.
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    Cited by:

    1. Luca Moretti & Martin Mayerl & Samuel Muehlemann & Peter Schlögl & Stefan C. Wolter, 2017. "So Similar and yet so Different: A Comparative Analysis of a Firm's Cost and Benefits of Apprenticeship Training in Austria and Switzerland," CESifo Working Paper Series 6711, CESifo.
    2. Maïlys Korber, 2019. "Does Vocational Education Give a Labour Market Advantage over the Whole Career? A Comparison of the United Kingdom and Switzerland," Social Inclusion, Cogitatio Press, vol. 7(3), pages 202-223.
    3. Peter Hoeschler & Uschi Backes-Gellner, 2017. "The Relative Importance of Personal Characteristics for the Hiring of Young Workers," Economics of Education Working Paper Series 0142, University of Zurich, Department of Business Administration (IBW), revised Jan 2018.
    4. Ludwig-Mayerhofer, Wolfgang & Pollak, Reinhard & Solga, Heike & Menze, Laura & Leuze, Kathrin & Edelstein, Rosine & Künster, Ralf & Ebralidze, Ellen & Fehring, Gritt & Kühn, Susanne, 2019. "Vocational Education and Training and Transitions into the Labor Market," EconStor Open Access Articles, ZBW - Leibniz Information Centre for Economics, pages 277-323.
    5. Luca Moretti & Martin Mayerl & Samuel Muehlemann & Peter Schloegl & Stefan C. Wolter, 2017. "So similar and yet so different: A comparative analysis of a firm's net costs and post-apprenticeship training benefits in Austria and Switzerland," Economics of Education Working Paper Series 0137, University of Zurich, Department of Business Administration (IBW), revised Apr 2018.
    6. Fitzenberger, Bernd & Licklederer, Stefanie & Zwiener, Hanna, 2015. "Mobility across firms and occupations among graduates from apprenticeship," Labour Economics, Elsevier, vol. 34(C), pages 138-151.
    7. Andreas Kuhn & Juerg Schweri & Stefan C. Wolter, 2019. "Local Norms Describing the Role of the State and the Private Provision of Training," CESifo Working Paper Series 7519, CESifo.
    8. Eggenberger, Christian & Rinawi, Miriam & Backes-Gellner, Uschi, 2018. "Occupational specificity: A new measurement based on training curricula and its effect on labor market outcomes," Labour Economics, Elsevier, vol. 51(C), pages 97-107.
    9. Kuhn, Andreas & Schweri, Jürg & Wolter, Stefan C., 2019. "Local Norms Describing the Role of the State and the Private Provision of Training," IZA Discussion Papers 12159, Institute of Labor Economics (IZA).
    10. Melina Heiniger & Christian Imdorf, 2018. "The role of vocational education in the transmission of gender segregation from education to employment: Switzerland and Bulgaria compared," Journal for Labour Market Research, Springer;Institute for Employment Research/ Institut für Arbeitsmarkt- und Berufsforschung (IAB), vol. 52(1), pages 1-21, December.
    11. Uschi Backes-Gellner & Patrick Lehnert, 2021. "The Contribution of Vocational Education and Training to Innovation and Growth," Economics of Education Working Paper Series 0177, University of Zurich, Department of Business Administration (IBW).
    12. Luca Moretti & Martin Mayerl & Samuel Muehlemann & Peter Schlögl & Stefan C. Wolter, 2017. "So Similar and yet so Different: A Comparative Analysis of a Firm's Cost and Benefits of Apprenticeship Training in Austria and Switzerland," CESifo Working Paper Series 6711, CESifo.
    13. Irene Kriesi & Juerg Schweri, 2019. "Types of Education, Achievement and Labour Market Integration over the Life Course," Social Inclusion, Cogitatio Press, vol. 7(3), pages 58-64.
    14. Juerg Schweri & Annina Eymann & Manuel Aepli, 2020. "Horizontal mismatch and vocational education," Applied Economics, Taylor & Francis Journals, vol. 52(32), pages 3464-3478, June.
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    More about this item

    Keywords

    apprenticeship; endogenous treatment; human capital; mobility; PISA; occupation; school-to-work transition; training;
    All these keywords.

    JEL classification:

    • C25 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Discrete Regression and Qualitative Choice Models; Discrete Regressors; Proportions; Probabilities
    • J24 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Human Capital; Skills; Occupational Choice; Labor Productivity
    • J31 - Labor and Demographic Economics - - Wages, Compensation, and Labor Costs - - - Wage Level and Structure; Wage Differentials
    • J62 - Labor and Demographic Economics - - Mobility, Unemployment, Vacancies, and Immigrant Workers - - - Job, Occupational and Intergenerational Mobility; Promotion

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