Moscow University of Finance and Law, Stavropol State Agrarian University, Petroleum and Gas University of Ploiesti, Institute of Agricultural Economics (IAE) Belgrade, RS Serbia, Bucharest Academy of Economic Studies, Stavropol State Agrarian University, Institute of Agricultural Economics (IEA) Belgrade, National University of Life and Environmental Sciences of Ukraine, Institute of Agricultural Economics (IEA) Belgrade, Stavropol State Agrarian University, The Research Institute for Agrarian Economy and Rural Development, University of Agronomic Sciences and Veterinary Medicine of Bucharest and Institute of Agricultural Economics (IEA) Belgrade