André Torre is Professor at the National Institute for Agronomic Research and the University of Paris-Saclay, France. Stefano Corsi is a researcher in the Department of Economics at the University of Milan, Italy. Michael Steiner is Professor in the Department of Economics at the University of Graz, Austria. Frédéric Wallet is a researcher at the National Institute for Agronomic Research and the University of Paris-Saclay, France. Hans Westlund is Professor at KTH Royal Institute of Technology, Stockholm, Sweden, and the Jönköping International Business School, Jönköping, Sweden.