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

  • Sandewall, Örjan

    ()

    (London School of Economics)

  • Cesarini, David

    ()

    (Department of Economics)

  • Johannesson, Magnus

    (Department of Economics)

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.

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Paper provided by Research Institute of Industrial Economics in its series Working Paper Series with number 806.

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Length: 37 pages
Date of creation: 24 Aug 2009
Date of revision:
Handle: RePEc:hhs:iuiwop:0806
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  11. Sandra E. Black & Paul J. Devereux & Kjell Salvanes, 2005. "From the Cradle to the Labor Market? The Effect of Birth Weight on Adult Outcomes," NBER Working Papers 11796, National Bureau of Economic Research, Inc.
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  13. Vikesh Amin, 2011. "Returns to Education: Evidence from UK Twins: Comment," American Economic Review, American Economic Association, vol. 101(4), pages 1629-35, June.
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  15. Miller, Paul & Mulvey, Charles & Martin, Nick, 2005. "Birth weight and schooling and earnings: estimates from a sample of twins," Economics Letters, Elsevier, vol. 86(3), pages 387-392, March.
  16. Behrman, Jere R & Rosenzweig, Mark R & Taubman, Paul, 1994. "Endowments and the Allocation of Schooling in the Family and in the Marriage Market: The Twins Experiment," Journal of Political Economy, University of Chicago Press, vol. 102(6), pages 1131-74, December.
  17. Jere R. Behrman & Mark R. Rosenzweig, 2004. "Returns to Birthweight," The Review of Economics and Statistics, MIT Press, vol. 86(2), pages 586-601, May.
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  19. Rouse, Cecilia Elena, 1999. "Further estimates of the economic return to schooling from a new sample of twins," Economics of Education Review, Elsevier, vol. 18(2), pages 149-157, April.
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  23. John Bound & Gary Solon, 1998. "Double Trouble: On the Value of Twins-Based Estimation of the Return to Schooling," NBER Working Papers 6721, National Bureau of Economic Research, Inc.
  24. Zhang, Junsen & Liu, Pak-Wai & Yung, Linda, 2007. "The Cultural Revolution and returns to schooling in China: Estimates based on twins," Journal of Development Economics, Elsevier, vol. 84(2), pages 631-639, November.
  25. Heather Royer, 2009. "Separated at Girth: US Twin Estimates of the Effects of Birth Weight," American Economic Journal: Applied Economics, American Economic Association, vol. 1(1), pages 49-85, January.
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  27. Miller, Paul & Mulvey, Charles & Martin, Nick, 2006. "The return to schooling: Estimates from a sample of young Australian twins," Labour Economics, Elsevier, vol. 13(5), pages 571-587, October.
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  30. Elizabeth U. Cascio & Ethan G. Lewis, 2006. "Schooling and the Armed Forces Qualifying Test: Evidence from School-Entry Laws," Journal of Human Resources, University of Wisconsin Press, vol. 41(2).
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