1. 1Institute of Sectoral Economics and Methodology, Faculty of Economics and Business, University of Debrecen, Debrecen 4032, Hungary
2. 2Institute of Applied Economics, Faculty of Economics and Business, University of Debrecen, Debrecen 4032, Hungary
3. 3Institute of Applied Informatics and Logistics, Faculty of Economics and Business, University of Debrecen, Debrecen 4032, Hungary