1. School of Economics, Northeast Agriculture University (NEAU), Harbin, China
2. Department of Finance, Accounting and Economics, University of Pitesti, Pitesti, Romania
3. Institute for Doctoral and Post-Doctoral Studies, “Lucian Blaga” University of Sibiu, Sibiu, Romania
4. Department of Political Economy and Public Finance, Economics and Business Statistics and Economic Policy, University of Castilla–-La Mancha, Cuenca, Spain
5. Department of Applied Economics, International Economy Institute, University of Alicante, Alicante, Spain