China and the United States have a choice: team up and develop the digital economy with technological breakthroughs in artificial intelligence and big data, or decouple and damage the global economy.That was the warning from China’s former vice-premier Zeng Peiyan, as he addressed a regional conference in Singapore on Wednesday.Zeng, who held the post from 2003 to 2008 and was a top economic policymaker in Beijing, said any decoupling of the world’s two largest economies – which are currently…