1. Department of Agriculture, Food and Environment (Di3A), University of Catania, Via S. Sofia n. 100, 95123 Catania, Italy
2. Agricultural Research Council and Economics (CREA)—Research Centre for Cereal and Industrial Crops, Corso Savoia, 190, 95024 Acireale, Italy
3. Department of Economics, Management and Business Law, University of Bari Aldo Moro, Largo Abbazia Santa Scolastica, 53, 70124 Bari, Italy