Hong Kong’s leader has begun a four-day visit to Beijing and Shanghai to deepen economic ties with the mainland, calling for closer collaboration on finance and innovation and technology (I&T), and pledging to help Chinese enterprises expand overseas. Speaking at the annual Beijing-Hong Kong Economic Cooperation Symposium on Wednesday, Chief Executive John Lee Ka-chiu said the Northern Metropolis would create a new platform for the two cities to cooperate on research and innovation. The...