1. Department of Economic Theory, Faculty of Economics, Southern Federal University, Bolshaya Sadovaya str. 105, 344006 Rostov-on-Don, Russia
2. Department of Economic Cybernetics, Faculty of Economics, Southern Federal University, Bolshaya Sadovaya str. 105, 344006 Rostov-on-Don, Russia
3. Department of Trade and Finance, Faculty of Economics and Management, Czech University of Life Sciences Prague, Kamýcká 129, Prague 6, 165 00 Prague, Czech Republic