Mr. Sai Xu is a Ph.D. student in the School of Economics at Nankai University (Tianjin, China). He is also a Certified Public Accountant and a Certified Tax Agent in China. His research interests are urban development and regional innovation. He is currently a visiting Ph.D. student at Columbia University who has been awarded a scholarship under the State Scholarship Fund of China. His current research focuses on the impact of urban public facilities construction on community capital.