From a methodological perspective, one reason for not finding any significant effects may be that the state-level analysis presented here does not provide sufficient variation in the supply of Seguro Popular over time. However, further analysis reported in Del Valle et al. ( A more important reason for not finding any significant effects may be that there is substantial heterogeneity in the impact of Seguro Popular across different groups of workers or that the impact of Seguro Popular is only concentrated in a specific segment of the workforce.