1. Department of Market and Consumption, University of Warmia and Mazury in Olsztyn, 10-720 Olsztyn, Poland
2. Department of Entrepreneurship and Management, University of Entrepreneurship and Law, 150 00 Praha, Czech Republic
3. Department of Administration and Public Management, The Bucharest University of Economic Studies, 010371 Bucharest, Romania
4. Department of Theory of Economics, University of Warmia and Mazury in Olsztyn, 10-720 Olsztyn, Poland
5. Department of Economics, University of Žilina, 01026 Žilina, Slovakia