First Author:   Robert Finger Agri-food & Agri-environmental Economics Group, ETH Zürich, Switzerland rofinger@ethz.ch   Sonneggstrasse 33 Zürich, 8092, Switzerland       Second Author: Nadja El Benni Agri-food & Agri-environmental Economics Group, ETH Zürich, Switzerland elbennin@ethz.ch   Zürich, 8092, Switzerland