“…In order to estimate the impact of a sudden and massive inflow of migrants on the labor market outcomes of natives, a common approach is to implement a difference-indifferences strategy by comparing wage (or employment) changes in the regions affected by the immigrant inflow to wage (or employment) changes in unaffected regions with similar characteristics (Card, 1990;Borjas, 2016;Peri and Yasenov, 2015;Foged and Peri, 2016;Tumen, 2016). Instead of using a post-treatment dummy, some studies rather use a measure of immigrant penetration across geographical areas to define a variable with different "treatment intensity" (Altonji and Card, 1991;Hunt, 1992;Dustmann et al, 30 The fact that the repatriates were more skilled than the pre-existing labor force is also documented in Baillet (1975); Borjas and Monras (2016); Clemens and Hunt (2017). 31 Conditional on education, the percent supply shifts induced by the repatriates are always weaker for women.…”