This paper analyzes the complexity of the contraction fixed point problem: compute an approximation to the fixed point V* = I*(V*) of a contraction mapping I* that maps a Banach space of continuous functions of variables into itself. We focus on quasi linear contractions where I* is a nonlinear...

In a recent paper, Hausman et al. (2012) propose a new estimator, HFUL (Heteroscedasticity robust Fuller), for the linear model with endogeneity. This estimator is consistent and asymptotically normally distributed in the many instruments and many weak instruments asymptotics. Moreover, this...