This paper investigates the causal effect of job training on wage rates in the presence of firm heterogeneity. When training affects worker sorting to firms, sample selection is no longer binary but is "multilayered". This paper extends the canonical Heckman (1979) sample selection model - which...

Reducing youth unemployment and generating more and better youth employment opportunities are key policy challenges worldwide. Active labor market programs for disadvantaged youth may be an effective tool in such cases, but the results have often been disappointing in Organisation for Economic...