Visitors inquire about products at the China-ASEAN Expo in Nanning, Guangxi Zhuang autonomous region, on Tuesday. A "substantial upgrade" of the China-ASEAN Free Trade Area may be announced during an upcoming summit in Laos, said Kao Kim Hourn, secretary-general of the Association of Southeast Asian Nations, on Wednesday. Noting that China and member economies of ASEAN have been working actively …
