NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

The More the Merrier? The Effect of Family Composition on Children's Education

Sandra E. Black, Paul G. Devereux, Kjell G. Salvanes

NBER Working Paper No. 10720
Issued in September 2004
NBER Program(s):   ED   LS   CH

Among the perceived inputs in the production' of child quality is family size; there is an extensive theoretical literature that postulates a tradeoff between child quantity and quality within a family. However, there is little causal evidence that speaks to this theory. Our analysis is able to overcome many limitations of the previous literature by using a rich dataset that contains information on the entire population of Norway over an extended period of time and allows us to match adult children to their parents and siblings. In addition, we use exogenous variation in family size induced by the birth of twins to isolate causation. Like most previous studies, we find a negative correlation between family size and children's educational attainment. However, when we include indicators for birth order, the effect of family size becomes negligible. This finding is robust to the use of twin births as an instrument for family size. In addition, we find that birth order has a significant and large effect on children's education; children born later in the family obtain less education. These findings suggest the need to revisit economic models of fertility and child production', focusing not only on differences across families but differences within families as well.

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Published: Black, Sandra E., Paul J. Devereux and Kjell G. Salvanes. "The More The Merrier? The Effect Of Family Size And Birth Order On Children's Education," Quarterly Journal of Economics, 2005, v120(2,May), 669-700.

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