China has become a new global leader in some areas of the digital economy. The development of new infrastructure, including 5G networks, and the reliance on e-commerce, however, is raising questions. How can 5G help ordinary people and how are live-stream and social media reshaping business models? For all the answers, we spoke to Chen Yubo, professor and director of Internet Development and Governance, Tsinghua University's School of Economics and Management.