7. Jack Ma, Alibaba (e-commerce), 37.4 billion
Founder and CEO of China's Alibaba.com Jack Ma Yun gestures while speaking during a session 'Who Will Shape the Agenda' at the World Economic Forum in Davos, Switzerland, Friday Jan. 26, 2007. The meeting moved into its third day Friday with continued discussions surrounding global warming, the Middle East, and the Internet. (AP Photo/Virginia Mayo)