Mogstad, Magne; Wiswall, Matthew - Institute for the Study of Labor (IZA) - 2010
restriction in IV estimation, and discusses possible remedies. We first examine the biases due to nonlinearity in the commonly … where theory suggests a nonlinear relationship, yet previous research has used linear IV estimators. We find that relaxing … the linearity restriction in the IV estimation changes the qualitative conclusions about the relevant economic theory and …