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The co-twin methodology and returns to schooling — testing a critical assumption

  • Sandewall, Örjan
  • Cesarini, David
  • Johannesson, Magnus

Twins-based estimates of the return to schooling have featured prominently in the economics of education literature. Their unbiasedness hinges critically on the assumption that within-pair variation in schooling is explained by factors unrelated to wage earning ability. This paper develops a framework for testing this assumption and shows, in a large sample of monozygotic twins, that the twins-based estimated return to schooling falls if adolescent IQ test scores are included in the wage equation. Using birth weight as an alternative proxy for ability yields qualitatively similar results. Our results thus cast doubt on the validity of twins-based estimates.

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Article provided by Elsevier in its journal Labour Economics.

Volume (Year): 26 (2014)
Issue (Month): C ()
Pages: 1-10

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Handle: RePEc:eee:labeco:v:26:y:2014:i:c:p:1-10
Contact details of provider: Web page: http://www.elsevier.com/locate/labeco

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  1. Dorothe Bonjour & Lynn F. Cherkas & Jonathan E. Haskel & Denise D. Hawkes & Tim D. Spector, 2003. "Returns to Education: Evidence from U.K. Twins," American Economic Review, American Economic Association, vol. 93(5), pages 1799-1812, December.
  2. Behrman, Jere R. & Rosenzweig, Mark R., 1999. ""Ability" biases in schooling returns and twins: a test and new estimates," Economics of Education Review, Elsevier, vol. 18(2), pages 159-167, April.
  3. Böckerman, Petri & Vainiomäki, Jari, 2013. "Stature and Life-Time Labor Market Outcomes: Accounting for Unobserved Differences," IZA Discussion Papers 7424, Institute for the Study of Labor (IZA).
  4. Neumark, David, 1999. "Biases in twin estimates of the return to schooling," Economics of Education Review, Elsevier, vol. 18(2), pages 143-148, April.
  5. Hanushek, Eric A. & Wößmann, Ludger, 2008. "The role of cognitive skills in economic development," Munich Reprints in Economics 20454, University of Munich, Department of Economics.
  6. 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.
  7. Orley Ashenfelter & Cecilia Rouse, 1997. "Income, Schooling, and Ability: Evidence from a New Sample of Identical Twins," NBER Working Papers 6106, National Bureau of Economic Research, Inc.
  8. Peter Gottschalk & Timothy M. Smeeding, 1997. "Cross-National Comparisons of Earnings and Income Inequality," Journal of Economic Literature, American Economic Association, vol. 35(2), pages 633-687, June.
  9. David Card, 2000. "Estimating the Return to Schooling: Progress on Some Persistent Econometric Problems," NBER Working Papers 7769, National Bureau of Economic Research, Inc.
  10. Samuel Bowles & Herbert Gintis, 2002. "The Inheritance of Inequality," Journal of Economic Perspectives, American Economic Association, vol. 16(3), pages 3-30, Summer.
  11. 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.
  12. Bound, John & Solon, Gary, 1999. "Double trouble: on the value of twins-based estimation of the return to schooling," Economics of Education Review, Elsevier, vol. 18(2), pages 169-182, April.
  13. Anders Bohlmark & Matthew J. Lindquist, 2006. "Life-Cycle Variations in the Association between Current and Lifetime Income: Replication and Extension for Sweden," Journal of Labor Economics, University of Chicago Press, vol. 24(4), pages 879-900, October.
  14. Isacsson, Gunnar, 1999. "Estimates of the return to schooling in Sweden from a large sample of twins," Labour Economics, Elsevier, vol. 6(4), pages 471-489, November.
  15. 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.
  16. Katz, Lawrence F. & Autor, David H., 1999. "Changes in the wage structure and earnings inequality," Handbook of Labor Economics, in: O. Ashenfelter & D. Card (ed.), Handbook of Labor Economics, edition 1, volume 3, chapter 26, pages 1463-1555 Elsevier.
  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.
  18. Sandra E. Black & Paul Devereux & Kjell G. Salvanes, 2007. "From the Cradle to the Labor Market? The Effect of Birth Weight on Adult Outcomes," Working Papers 200718, Geary Institute, University College Dublin.
  19. Vikesh Amin, 2011. "Returns to Education: Evidence from UK Twins: Comment," American Economic Review, American Economic Association, vol. 101(4), pages 1629-35, June.
  20. Miller, Paul W & Mulvey, Charles & Martin, Nick, 1995. "What Do Twins Studies Reveal about the Economic Returns to Education? A Comparison of Australian and U.S. Findings," American Economic Review, American Economic Association, vol. 85(3), pages 586-99, June.
  21. 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.
  22. Joshua Angrist & Alan Krueger, 1990. "Does Compulsory School Attendance Affect Schooling and Earnings?," Working Papers 653, Princeton University, Department of Economics, Industrial Relations Section..
  23. Paul Taubman, 1976. "Earnings, Education, Genetics, and Environment," Journal of Human Resources, University of Wisconsin Press, vol. 11(4), pages 447-461.
  24. Card, David, 1999. "The causal effect of education on earnings," Handbook of Labor Economics, in: O. Ashenfelter & D. Card (ed.), Handbook of Labor Economics, edition 1, volume 3, chapter 30, pages 1801-1863 Elsevier.
  25. 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.
  26. 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.
  27. 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).
  28. Yoram Ben-Porath, 1967. "The Production of Human Capital and the Life Cycle of Earnings," Journal of Political Economy, University of Chicago Press, vol. 75, pages 352.
  29. Gunnar Isacsson, 2004. "Estimating the economic return to educational levels using data on twins," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 19(1), pages 99-119.
  30. Griliches, Zvi, 1977. "Estimating the Returns to Schooling: Some Econometric Problems," Econometrica, Econometric Society, vol. 45(1), pages 1-22, January.
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