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The More the Merrier? The Effect of Family Size and Birth Order on Children’s Education. By Sandra Black Paul Devereux Kjell Salvanes Quarterly Journal of Economics, 2005. Central Question. How do family size and birth order affect adult outcomes like education?
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The More the Merrier?The Effect of Family Size and Birth Order on Children’s Education By Sandra Black Paul Devereux KjellSalvanes Quarterly Journal of Economics, 2005
Central Question How do family size and birth order affect adult outcomes like education? Similar to ALS paper in its use of twins & sex mix instruments to estimate effect of family size. *BUT* Considers the role that birth order might play in explaining effects of size.
Why do we care? • Informs our understanding of the child production function—specifically, is there a quantity/quality tradeoff? • Policies affecting (directly or indirectly) fertility and family size.
First: Family Size • Use IV strategy similar to ALS • Add controls for family background and birth order Data • Adult population of Norway, 1986-2000. • Can match parents to their children, and determine birth order • About 1.4 million children from 647,000 families.
More on Family Size • Note Table 4 coefficients on birth order • Twins IV: • Twins increase family size by .7 to .8 (compare to ALS) • With IV, do not find evidence of large negative effects of family size (compare to ALS) • Same Sex IV: • Same sex increases prob. of 3rd birth by .086 (compare to ALS) • Find large positive effect of family size, though they don’t believe it.
Birth Order First, how might birth order affect education?
Birth Order Challenges with estimation: Family size: how do you separate the effect of being the 10th kid from the effect of being in a family with 10 kids? Cohort effects: later-born kids are always born more recently. Age of parents: parents of first-borns are younger. Spacing: may be correlated with order Can handle all of these things with enough controls, but need really good data to observe them all. --BDS have, and can also include family fixed effects: what is the within-family effect of birth order?
Birth Order: More Results • Birth order effects larger for women • May also be larger for higher-SES parents • Not due to marital dissolution (though only-child effect may be) • High birth order also negatively associated with wages and LFP, especially for women.
Birth Order: More Results From Table IX:
Conclusions Much of the observed negative relationship between family size & outcomes seems to be driven by birth order. As families get smaller, average outcomes will improve, but only because there are fewer high birth-order kids. “The difference in educational attainment between the first child and the fifth child in a five-child family is roughly equal to the difference between Black and White . . .” Question: Why does birth order matter?