1. Jiadong Tong is a Professor of International Economics at School of Economics; Nankai University; Tianjin P.R. China
2. Zijun Wang is an Associate Professor of Finance at the College of Business; University of Texas at San Antonio; San Antonio Texas USA
3. Jian Yang is a Professor of Finance at the Business School, University of Colorado Denver, Denver, Colorado, and the Honorary Director at Center for Commodity Markets and Behavioral Decision Research; Dongbei University of Finance and Economics; Dalian Liaoning P.R. China