1. Department of Economics, Engineering, Society and Business Organization (DEIM), University of Tuscia, Via del Paradiso 47, 01100 Viterbo, Italy
2. Thünen Institute of Market Analysis, Bundesallee 63, 38116 Braunschweig, Germany
3. Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, Via san Camillo de Lellis snc, 01100 Viterbo, Italy