1. Department of Economics; Faculty of Economic and Administrative Sciences, Anadolu University; Eskisehir Turkey
2. Franke College of Business; Northern Arizona University; Flagstaff, AZ USA
3. School of Economics; Anhui University; Hefei China
4. Department of Economics; Boston College; Chestnut Hill, MA USA
5. Center for Economic Research; Shandong University; Jinan China