1. The Center for Research on International Economics and Department of Economics, University of Wisconsin-Milwaukee, Milwaukee, WI, USA
2. Department of Finance, Feng Chia University, Taichung, Taiwan
3. University of Mazandaran, Babolsar, Iran
4. Department of Africology, University of Wisconsin-Milwaukee, Milwaukee, WI, USA
5. Department of Finance, Allameh Tabataba’i University, Tehran, Iran
6. Trade Promotion Organization of Iran, Tehran, Iran