Preview: Chairman Ma

Chinese company Alibaba is now valued at $231 billion after taking its shares public last week in the most valuable IPO in Wall St. history. How did Jack Ma build Alibaba into the world’s largest e-commerce company, dwarfing Amazon and eBay combined? Lara Logan went to China to find out. Watch her report Sunday, Sept. 28 at 7 p.m. ET/PT.