1. Univ. Grenoble Alpes, INRAE, CNRS, Grenoble INP, GAEL, Grenoble, France
2. Toulouse School of Economics, INRAE, University of Toulouse Capitole, Toulouse, France
3. INRAE-Economie Publique, Paris, France
4. Department of Economics and Management and SEEDS, Univ. of Ferrara, Italy
5. INRAE-Moisa, Montpellier, France
6. INRAE-CESAER, UBFC, Dijon, France