“…Despite the volume of empirical work, the evidence is far from conclusive. The results range from studies which find small or null employment effects (Card and Krueger, 1995;Dube et al, 2010Dube et al, , 2016Ferraro et al, 2018;Cengiz et al, 2019;Harasztosi and Lindner, 2019;Dustmann et al, 2019) to those that find negative effects (Neumark and Wascher, 2008;Neumark et al, 2014;Meer and West, 2016;Clemens and Wither, 2019) or that find negative effects only on employment flows, not stocks (Cardoso and Portugal, 2006;Brochu and Green, 2013;Dube et al, 2016). This mixed evidence can be explained by differences in groups of workers analyzed (Dube et al, 2010;Neumark et al, 2014;Clemens and Wither, 2019), time heterogeneity, which biases the research design (Allegretto et al, 2017), the size and temporal dimension of the shock used (Sorkin, 2015;Aaronson et al, 2018), or the fact that labor markets are far from competitive, i.e.…”