1. School of Economics and Management, Tsinghua University, Beijing, China, e-mail: chenjin@sem.tsinghua.edu.cn
2. Research Center of Technological Innovation, Tsinghua University, Beijing, China, e-mail: chenjin@sem.tsinghua.edu.cn
3. School of Management and Economics, Beijing Institute of Technology, Beijing, China, e-mail: yxm11@tsinghua.org.cn
4. Technology and Management Centre for Development, University of Oxford, Oxford, UK, e-mail: xiaolan.fu@qeh.ox.ac.uk
5. Business School, University of Technology Sydney, New South Wales, Australia, e-mail: bruce.mckern@uts.edu.au