[1] Univ Sri Jayewardenepura, Fac Appl Sci, Management Sci Unit, Nugegoda 10250, Sri Lanka
[2] Epoka Univ, Dept Econ, Tirana 1032, Albania
[3] Warsaw Univ Technol, Fac Adm & Social Sci, PL-00661 Warsaw, Poland
[4] Romanian Acad, Ctr Financial & Monetary Res Victor Slavescu, Bucharest 050711, Romania
[5] Romanian Amer Univ, Res Dept, Bucharest 012101, Romania