Shulin Liu University of International Business and Economics   Beijing, China   slliu@uibe.edu.cn   https://soe.uibe.edu.cn/szdw/xyjsaxx/yyjrx/99708958307d4971bfcabef9b8cf9cec.htm           JEL Areas: C6 : Mathematical Methods and Programming: General C7 : Game Theory and Bargaining Theory:General