演講者簡介 : Professor Pascual Restrepo received his Ph.D. from the Massachusetts Institute of Technology in 2016. He is currently an Associate Professor at Yale University. His research focuses on the impact of technology on inequality, labor markets, and growth.
Working Paper Title : Shift-Share Design Under Imperfect Substitution
Working Paper Speaker : Professor Chen Liu
Working Paper Speaker Biography : Professor Chen Liu received his Ph.D. from the University of California, San Diego in 2019. He is currently an Assistant Professor at the National University of Singapore His research areas are Spatial Economics, International Trade, and Labor Economics.
Working Paper Abstract : The theory of Shift-Share design assumes perfect substitution across skill groups. This paper investigates the validity of instrumental variables in a context where skills are imperfect substitutes and industries vary by skill intensity. I demonstrate that the previously established identifying conditions are no longer sufficient and that identification requires an additional moment restriction. I propose a re-centered approach that remains valid. Applying this approach to various empirical settings, I find evidence suggesting that it can reduce bias in certain contexts.
