The Effect of Schooling on Earnings: Evidence on the role of family background from a large sample of Norwegian twins
A large representative sample of Norwegian twins is used to estimate the causal effect of schooling on earnings in Norway, separately for men and women. The within-twin-pair estimates reveal that standard cross section (OLS) estimates of the schooling effect on male hourly earnings are biased upwards. For women, no such bias is found. However, family background appears to affect both educational attainment and post-schooling labour supply of women, implying that the standard estimate of the effect of schooling on female annual earnings is upward biased.
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