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Small Family, Smart Family? Family Size and the IQ Scores of Young Men

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Author Info
Sandra E. Black
Paul J. Devereux
Kjell G. Salvanes

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Abstract

How do families influence the ability of children? Cognitive skills have been shown to be a strong predictor of educational attainment and future labor market success; as a result, understanding the determinants of cognitive skills can lead to a better understanding of children's long run outcomes. This paper uses a large dataset on the male population of Norway and focuses on one family characteristic: the effect of family size on IQ. Because of the endogeneity of family size, we instrument for family size using twin births and sex composition. IV estimates using sex composition as an instrument show no negative effect of family size; however, IV estimates using twins imply that family size has a negative effect on IQ. Our results suggest that effect of family size depends on the type of family size intervention. We conclude that there are no important negative effects of expected increases in family size on IQ but that unexpected shocks to family size resulting from twin births have negative effects on the IQ of existing children.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 13336.

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Date of creation: Aug 2007
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Handle: RePEc:nbr:nberwo:13336

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Find related papers by JEL classification:
J01 - Labor and Demographic Economics - - General - - - Labor Economics: General
J13 - Labor and Demographic Economics - - Demographic Economics - - - Fertility; Family Planning; Child Care; Children; Youth
J24 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Human Capital; Skills; Occupational Choice; Labor Productivity

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Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. 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, MIT Press, vol. 122(1), pages 409-439, 02. [Downloadable!] (restricted)
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  2. Gary S. Becker & Robert J. Barro, 1988. "A Reformulation of the Economic Theory of Fertility," NBER Working Papers 1793, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    Other versions:
  3. Sandra E. Black & Paul J. Devereux & Kjell G. Salvanes, 2007. "Older and Wiser? Birth Order and IQ of Young Men," IZA Discussion Papers 3007, Institute for the Study of Labor (IZA). [Downloadable!]
    Other versions:
  4. Bronars, Stephen G & Grogger, Jeff, 1994. "The Economic Consequences of Unwed Motherhood: Using Twin Births as a Natural Experiment," American Economic Review, American Economic Association, vol. 84(5), pages 1141-56, December. [Downloadable!] (restricted)
  5. 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. [Downloadable!]
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  6. Angrist, Joshua D & Evans, William N, 1998. "Children and Their Parents' Labor Supply: Evidence from Exogenous Variation in Family Size," American Economic Review, American Economic Association, vol. 88(3), pages 450-77, June. [Downloadable!] (restricted)
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  7. Matthias Doepke, 2004. "Accounting for Fertility Decline During the Transition to Growth," Journal of Economic Growth, Springer, vol. 9(3), pages 347-383, 09. [Downloadable!]
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  8. Becker, Gary S & Lewis, H Gregg, 1973. "On the Interaction between the Quantity and Quality of Children," Journal of Political Economy, University of Chicago Press, vol. 81(2), pages S279-88, Part II, . [Downloadable!] (restricted)
  9. Rosenzweig, Mark R & Wolpin, Kenneth I, 1980. "Testing the Quantity-Quality Fertility Model: The Use of Twins as a Natural Experiment," Econometrica, Econometric Society, vol. 48(1), pages 227-40, January. [Downloadable!] (restricted)
  10. Robert Kaestner, 1996. "Are Brothers Really Better? Sibling Sex Composition and Educational Achievement Revisited," NBER Working Papers 5521, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  11. Neal, Derek A & Johnson, William R, 1996. "The Role of Premarket Factors in Black-White Wage Differences," Journal of Political Economy, University of Chicago Press, vol. 104(5), pages 869-95, October. [Downloadable!] (restricted)
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  12. Gary S. Becker & James S. Duesenberry & Bernard Okun, 1960. "An Economic Analysis of Fertility," NBER Chapters, in: Demographic and Economic Change in Developed Countries, pages 225-256 National Bureau of Economic Research, Inc. [Downloadable!]
  13. Behrman, Jere R & Pollak, Robert A & Taubman, Paul, 1989. "Family Resources, Family Size, and Access to Financing for College Education," Journal of Political Economy, University of Chicago Press, vol. 97(2), pages 398-419, April. [Downloadable!] (restricted)
  14. Jaisri Gangadharan & Joshua Rosenbloom & Joyce Jacobson & James Wishart Pearre III, 1996. "The Effects of Child-Bearing on Married Women's Labor Supply and Earnings: Using Twin Births as a Natural Experiment," NBER Working Papers 5647, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  15. Olivier Deschenes, 2002. "Estimating the Effects of Family Background on the Return to Schooling," University of California at Santa Barbara, Economics Working Paper Series 10-02, Department of Economics, UC Santa Barbara. [Downloadable!]
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  16. Orley Ashenfelter & Cecilia Rouse, 1998. "Income, Schooling, And Ability: Evidence From A New Sample Of Identical Twins," The Quarterly Journal of Economics, MIT Press, vol. 113(1), pages 253-284, February. [Downloadable!] (restricted)
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  17. Gordon B. Dahl & Enrico Moretti, 2004. "The Demand for Sons: Evidence from Divorce, Fertility, and Shotgun Marriage," NBER Working Papers 10281, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  18. Butcher, Kristin F & Case, Anne, 1994. "The Effect of Sibling Sex Composition on Women's Education and Earnings," The Quarterly Journal of Economics, MIT Press, vol. 109(3), pages 531-63, August. [Downloadable!] (restricted)
  19. Julio Cáceres-Delpiano, 2006. "The Impacts of Family Size on Investment in Child Quality," Journal of Human Resources, University of Wisconsin Press, vol. 41(4). [Downloadable!] (restricted)
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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Alma Cohen & Rajeev Dehejia & Dmitri Romanov, 2007. "Do Financial Incentives Affect Fertility?," NBER Working Papers 13700, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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