How did Jack Ma, a teacher with no business training, become one of China's - indeed, the world's - most successful entrepreneurs?

The BBC's business editor Kamal Ahmed looks at the man behind the online retail giant Alibaba Group - a company described as a mix between Amazon and Ebay - which is due to list on the New York Stock Exchange later this month, making Alibaba one of the most valuable internet companies in the world.

Jack Ma is no ordinary business leader. How many other global tycoons like to fill a stadium with their employees only to step on stage, be-wigged, to deliver not bland corporate messages, but Lion King songs?

Producer: Ben Crighton

Archive clips from the film 'Crocodile in the Yangtze: The Alibaba Story' (by Porter Erisman).