Jack Ma calls for open and free trade at CIIE

Chinese billionaire and Alibaba co-founder Jack Ma has called for open and free trade, saying "trade war is the most stupid thing in this world".

Ma made the remarks on Monday at a forum during this week's ongoing China International Import Expo, that will continue until Saturday.

According to Ma, China is shifting from an export to import economy that will bring the greatest challenge for China, and a great opportunity for the world.