Older and Wiser? Birth Order and IQ of Young Men
While recent research finds strong evidence that birth order affects children's outcomes such as education and earnings, the evidence on the effects of birth order on IQ is decidedly mixed. This paper uses a large dataset on the population of Norway that allows us to precisely measure birth order effects on IQ using both cross-sectional and within-family methods. Importantly, irrespective of method, we find a strong and significant effect of birth order on IQ, and our results suggest that earlier born children have higher IQs. Our preferred estimates suggest differences between first-borns and second-borns of about one fifth of a standard deviation or approximately 3 IQ points. Despite these large average effects, birth order only explains about 3% of the within-family variance of IQ. When we control for birth endowments, the estimated birth order effects increase. Thus, our analysis suggests that birth order effects are not biologically determined. Also, there is no evidence that birth order effects occur because later-born children are more affected by family breakdown.
|Date of creation:||Jul 2007|
|Publication status:||published as Sandra E. Black & Paul J. Devereux & Kjell G. Salvanes, 2011. "Older and Wiser? Birth Order and IQ of Young Men," CESifo Economic Studies, Oxford University Press, vol. 57(1), pages 103-120, March.|
|Note:||CH ED LS|
|Contact details of provider:|| Postal: National Bureau of Economic Research, 1050 Massachusetts Avenue Cambridge, MA 02138, U.S.A.|
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- Alison Booth & Hiau Kee, 2009.
"Birth order matters: the effect of family size and birth order on educational attainment,"
Journal of Population Economics,
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- Sandra E. Black & Paul J. Devereux & Kjell G. Salvanes, 2005. "The More the Merrier? The Effect of Family Size and Birth Order on Children's Education," The Quarterly Journal of Economics, Oxford University Press, vol. 120(2), pages 669-700.
- Paul J. Devereux & Sandra E. Black & Kjell G. Salvanes, 2005. "The more the merrier? The effect of family size and birth order on children's education," Open Access publications 10197/310, School of Economics, University College Dublin.
- S Black & Paul Devereux & Kjell Salvanes, 2005. "The More the Merrier? The Effect of Family Size and Birth Order on Childrens Education," CEE Discussion Papers 0050, Centre for the Economics of Education, LSE.
- Sandra E. Black & Paul J. Devereux & Kjell G. Salvanes, 2007. "From the Cradle to the Labor Market? The Effect of Birth Weight on Adult Outcomes," The Quarterly Journal of Economics, Oxford University Press, vol. 122(1), pages 409-439.
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- repec:ucn:wpaper:10197/317 is not listed on IDEAS
- Behrman, Jere R & Taubman, Paul, 1986. "Birth Order, Schooling, and Earnings," Journal of Labor Economics, University of Chicago Press, vol. 4(3), pages 121-145, July. Full references (including those not matched with items on IDEAS)
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