We derive testable implications of instrument validity in just identified treatment effect models with endogeneity and consider several tests. The identifying assumptions of the local average treatment effect allow us to both point identify and bound the mean potential outcomes of the always...

The aim of this research is to investigate the relationship between obesity and wages, using data for nine countries from the European Community Household Panel (ECHP) over the period 1998-2001. We improve upon the existing literature by adopting a Quantile Regression approach to characterize...

This paper contributes to the empirical literature on auctions and negotiations. Using healthcare facilities data on procurement contracts, I find evidence that auctions do not yield lower prices than negotiations. This result is robust to specifications tackling quality differences, endogenous...

This paper explores the interrelation between health and work decisions of older workers. For this, two issues are of relevance. Firstly, health and work may be endogenously related because of direct effects of health on work and vice versa, and because of unobservables that may relate observed...