论文题目：Clement Imbert, Marlon Seror, Yifan Zhang and Yanos Zylberberg. Migrants and Firms: Evidence from China, 2019, working paper
How does rural-urban migration shape urban production in developing countries? We use longitudinal data on Chinese manufacturing firms between 2001 and 2006, and exploit exogenous variation in rural-urban migration induced by agricultural price shocks for identification. We find that, when immigration increases, manufacturing production becomes more labor-intensive in the short run. In the longer run, firms innovate less, move away from capital-intensive technologies, and adopt final products that use low-skilled labor more intensively. We develop a model with endogenous technological choice, which rationalizes these findings, and we estimate the effect of migration on factor productivity and factor allocation across firms.