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The Co-twin Methodology and Returns to Schooling – Testing a Critical Assumption

Author

Listed:
  • Sandewall, Örjan

    (London School of Economics)

  • Cesarini, David

    (Department of Economics)

  • Johannesson, Magnus

    (Department of Economics)

Abstract

Twins-based estimates of the return to schooling feature prominently in the labor economics literature. The validity of such estimates hinges critically on the assumption that within-pair variation in schooling is explained by factors which are unrelated to wage earning ability. This paper develops a framework for testing this assumption, and finds, using a unique dataset of monozygotic twins, strong evidence against it. Di¤erences in adolescent IQ test scores predict within-pair variation in educational attainment, and including IQ in the wage equation causes within-pair point estimates for the returns to schooling to decline significantly. Our results thus cast doubt on the validity of estimates derived from the co-twin literature.

Suggested Citation

  • Sandewall, Örjan & Cesarini, David & Johannesson, Magnus, 2009. "The Co-twin Methodology and Returns to Schooling – Testing a Critical Assumption," Working Paper Series 806, Research Institute of Industrial Economics.
    • Handle: RePEc:hhs:iuiwop:0806
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    Blog mentions

    As found by EconAcademics.org, the blog aggregator for Economics research:
    1. Twins as an economic model
      by Kevin Denny in Geary Behaviour Centre on 2009-09-02 12:19:00

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    Cited by:

    1. Amin, Vikesh & Lundborg, Petter & Rooth, Dan-Olof, 2015. "The intergenerational transmission of schooling: Are mothers really less important than fathers?," Economics of Education Review, Elsevier, vol. 47(C), pages 100-117.
    2. Erik Plug & Dinand Webbink & Nick Martin, 2014. "Sexual Orientation, Prejudice, and Segregation," Journal of Labor Economics, University of Chicago Press, vol. 32(1), pages 123-159.
    3. Petter Lundborg & Carl Hampus Lyttkens & Paul Nystedt, 2016. "The Effect of Schooling on Mortality: New Evidence From 50,000 Swedish Twins," Demography, Springer;Population Association of America (PAA), vol. 53(4), pages 1135-1168, August.
    4. Petter Lundborg & Anton Nilsson & Dan-Olof Rooth, 2016. "The health-schooling relationship: evidence from Swedish twins," Journal of Population Economics, Springer;European Society for Population Economics, vol. 29(4), pages 1191-1215, October.
    5. Vikesh Amin & Jere Behrman, 2014. "Do more-schooled women have fewer children and delay childbearing? Evidence from a sample of US twins," Journal of Population Economics, Springer;European Society for Population Economics, vol. 27(1), pages 1-31, January.
    6. Berner Shalem, Rachel & Cornaglia, Francesca & De Neve, Jan-Emmanuel, 2012. "The enduring impact of childhood experience on mental health: evidence using instrumented co-twin data," LSE Research Online Documents on Economics 51522, London School of Economics and Political Science, LSE Library.
    7. Ukaj MIC & Mustafa Topxhiu RAHMIJE, 2019. "The returns to investment in education: Some theoretical and empirical insights," Economics and Applied Informatics, "Dunarea de Jos" University of Galati, Faculty of Economics and Business Administration, issue 1, pages 193-203.
    8. Plamen Nikolov & Hongjian Wang & Kevin Acker, 2020. "Wage premium of Communist Party membership: Evidence from China," Pacific Economic Review, Wiley Blackwell, vol. 25(3), pages 309-338, August.
    9. Mortensen, Laust H., 2013. "Socioeconomic inequality in birth weight and gestational age in Denmark 1996–2007: Using a family-based approach to explore alternative explanations," Social Science & Medicine, Elsevier, vol. 76(C), pages 1-7.
    10. Amin, Vikesh & Behrman, Jere R. & Spector, Tim D., 2013. "Does more schooling improve health outcomes and health related behaviors? Evidence from U.K. twins," Economics of Education Review, Elsevier, vol. 35(C), pages 134-148.
    11. Lundborg, Petter & Nilsson, Anton & Rooth, Dan-Olof, 2011. "Does Early Life Health Predict Schooling Within Twin Pairs?," IZA Discussion Papers 5803, Institute of Labor Economics (IZA).
    12. Xue, Sen & Kidd, Michael P. & Le, Anh T. & Kirk, Kathy & Martin, Nicholas G., 2019. "The Role of Locus of Control in Education, Occupation, Income and Healthy Habits: Evidence from Australian Twins," GLO Discussion Paper Series 371, Global Labor Organization (GLO).
    13. Lång, Elisabeth & Nystedt, Paul, 2018. "Two by two, inch by inch: Height as an indicator of environmental conditions during childhood and its influence on earnings over the life cycle among twins," Economics & Human Biology, Elsevier, vol. 28(C), pages 53-66.
    14. Bennett, Patrick, 2018. "The heterogeneous effects of education on crime: Evidence from Danish administrative twin data," Labour Economics, Elsevier, vol. 52(C), pages 160-177.
    15. Savelyev, Peter A. & Ward, Benjamin C. & Krueger, Robert F. & McGue, Matt, 2022. "Health endowments, schooling allocation in the family, and longevity: Evidence from US twins," Journal of Health Economics, Elsevier, vol. 81(C).
    16. Petter Lundborg & Martin Nordin & Dan Olof Rooth, 2018. "The intergenerational transmission of human capital: the role of skills and health," Journal of Population Economics, Springer;European Society for Population Economics, vol. 31(4), pages 1035-1065, October.
    17. Xue, Sen & Kidd, Michael P. & Le, Anh.T. & Kirk, Kathy & Martin, Nicholas G., 2020. "The role of locus of control in adulthood outcomes: Evidence from Australian twins," Journal of Economic Behavior & Organization, Elsevier, vol. 179(C), pages 566-588.
    18. Gerdtham, Ulf-G & Lundborg, Petter & Lyttkens, Carl Hampus & Nystedt, Paul, 2012. "Do Socioeconomic Factors Really Explain Income-Related Inequalities in Health? Applying a Twin Design to Standard Decomposition Analysis," Working Papers 2012:21, Lund University, Department of Economics.
    19. Lundborg, Petter & Nordin, Martin & Rooth, Dan-Olof, 2011. "The Intergenerational Transmission of Human Capital: Exploring the Role of Skills and Health Using Data on Adoptees and Twins," IZA Discussion Papers 6099, Institute of Labor Economics (IZA).
    20. Maczulskij, Terhi & Viinikainen, Jutta, 2018. "Is personality related to permanent earnings? Evidence using a twin design," Journal of Economic Psychology, Elsevier, vol. 64(C), pages 116-129.
    21. Petri Böckerman & Pekka Ilmakunnas & Jari Vainiomäki, 2018. "Using Twins to Resolve the Twin Problem of Having a Bad Job and a Low Wage," Manchester School, University of Manchester, vol. 86(2), pages 155-177, March.
    22. Bhalotra, Sonia & Clarke, Damian, 2022. "Analysis of Twins," The Warwick Economics Research Paper Series (TWERPS) 1428, University of Warwick, Department of Economics.
    23. Kaarina Määttä & Heini Päiveröinen & Riikka Määttä & Satu Uusiautti, 2016. "How Did I Become Me?—Identical Female Twins Describe the Development of Their Individuality," Journal of Educational and Developmental Psychology, Canadian Center of Science and Education, vol. 6(2), pages 1-37, November.

    More about this item

    Keywords

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    JEL classification:

    • I21 - Health, Education, and Welfare - - Education - - - Analysis of Education
    • J24 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Human Capital; Skills; Occupational Choice; Labor Productivity

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