In many healthcare markets, physicians can influence the volume (volume response) and the composition of the services provided (substitution response). The goal and main contribution of this paper is to empirically assess the relative importance of these two behavioral channels. Our analysis is...

We analyze whether the possibility for physicians to dispense drugs increases health care expenditures due to the incentives created by the markup on drugs sold. Using comprehensive physician-level data from Switzerland, we exploit the fact that there is regional variation in the dispensing...