Finding an instrument that is orthogonal to the disturbance term in the wage equation has been a topic of great deal of debate. Recently, Chesson et al. (2006) proposed that higher discount rates are significantly associated with a range of sexual behaviours, including having sex before age of...

This paper uses quantile regression techniques to analyze heterogeneous patterns of return to education across the conditional wage distribution in four transition countries. We correct for sample selection bias using a procedure suggested by Buchinsky (2001), which is based on a Newey (1991,...

Finding an instrument that is orthogonal to the disturbance term in the wage equation has been a topic of great deal of debate. Recently, Chesson et al. (2006) proposed that higher discount rates are significantly associated with a range of sexual behaviours, including having sex before age of...