Mr. Chongrui Yang is a Junior Research Assistant at the CUHK-Tsinghua Joint Research Center for Chinese Economy. His research interests include Urban Economics, Public Economics, Text Analysis and Social Connectedness. He has assisted in processing large amounts of data on urban economics and using cell phone signals to estimate people's travel patterns. Recently, he has been working on the dynamic classification of business scope in China. Mr. Yang graduated from Renmin University of China in 2022 with a Bachelor degree in Public Finance.