Gary-Bobo, Robert J.; Picard, Natalie; Prieto, Ana - C.E.P.R. Discussion Papers - 2006
, and uses these variables as instruments to estimate returns to education, with the help of a rich set of individual data … two stage method is used to estimate log-wage equations, taking care of education endogeneity, using birth order and the … number of siblings as instruments. The OLS estimates of returns to education are biased downwards, when females are …