1. Department of Statistics and Econometrics Bucharest University of Economic Studies Bucharest Romania
2. Institute of National Economy Bucharest Romania
3. Department of Cybernetics, Economic Informatics, Finance and Accounting Petroleum‐Gas University of Ploiesti Ploiesti Romania
4. University School of Management Studies Guru Gobind Singh Indrparastha University New Delhi India
5. National Institute of Economic Researches “Costin C. Kirițescu” Bucharest Romania