“…This may 2 Note that, in contrast, the related literature on returns to training provided to unemployed individuals includes several experimental and quasi-experimental contributions (Card et al 2010) including, very recently, novel analyses using machine learning methods (Cockx et al 2020, Zimmert 2020. Another important related literature is about the (individual) wage (and employment) returns to training (Leuven & Oosterbeek 2008, Brunello et al 2012, Goerlitz & Tamm 2016, Dauth 2016. correspond to a positive form of training 'lock-in', in contrast to the case of training programmes for the unemployed, which may reduce transitions to employment at least in the short-run.…”