[1] Univ Cattolica Sacro Cuore, Dept Econ & Social Sci, Piacenza, Italy
[2] Univ Cattolica Sacro Cuore, Dept Agr & Food Econ, Via Emilia Parmense 84, I-29122 Piacenza, Italy
[3] Wageningen Univ, Agr Econ & Rural Policy Grp, Wageningen, Netherlands
[4] Univ Svizzera italiana, Inst Law IDUSI, Fac Econ, Lugano, Switzerland
[5] Univ Svizzera Italiana, Fac Econ, Lugano, Switzerland