Konstantinos Chalioris, Economist, Master in Sustainable Development, Harokopio University, Email: 
Roido Mitoula, Professor, Harokopio University, Email:
Eleni Theodoropoulou, Professor, Harokopio University, Email: 
Panagiotis Kaldis, Professor, University of West Attica, Email: 

DOI: 10.26341/ISSN.2241-4002-2018-1A-6