1. School of Business and Economics, University Brunei Darussalam, Tungku Link BE1410, Brunei
2. Department of Cybernetics, Economic Informatics, Finance and Accounting, Petroleum-Gas University of Ploiesti, 100680 Ploiesti, Romania
3. Institute of National Economy, 050771 Bucharest, Romania
4. School of Business, Computing and Social Sciences, Saint Andrew the First-Called Georgian University, Tbilisi 0179, Georgia
5. Department of Statistics and Econometrics, Bucharest University of Economic Studies, 010552 Bucharest, Romania