Institute of Agricultural Economics (IAE) Belgrade, RS Serbia, Institute of Agricultural Economics (IEA) Belgrade, Petroleum and Gas University of Ploiesti, Bucharest Academy of Economic Studies, Institute of Agricultural Economics (IEA) Belgrade, Stavropol State Agrarian University, University of Agronomic Sciences and Veterinary Medicine of Bucharest, Petroleum and Gas University of Ploiesti - Department of Economic Analysis, Modeling and Statistics, The Research Institute for Agrarian Economy and Rural Development, Independent, University of Belgrade, Federal Institute of Agricultural Economics, Independent, University of Belgrade, University of Novi Sad, University Business Academy, Novi Sad, Independent, Metropolitan University, Belgrade, Metropolitan University, Belgrade and University of Novi Sad