The recent visit of Xia Baolong, director of the Hong Kong and Macau Affairs Office, carried the task of accelerating the development of the Northern Metropolis. This is not another urban expansion, but a strategic test of whether Hong Kong can reinvent its role in the nation’s innovation landscape.At its core, the Northern Metropolis bears a dual mission. For Hong Kong, it must become a growth engine, creating a third curve of development, beyond finance and real estate, by nurturing original...