CONFLICT OF INTEREST STATEMENT None. Supporting Information Filename Description hec4821-sup-0001-suppl-data.docx17.5 MB Supporting Information S1 REFERENCES , & (2018). Econometric methods for program evaluation. Annual Review of Economics, 10(1), 465–503. https://doi.org/10.1146/annurev-economics-080217-053402 , , & (2018a). Endogenous stratification in randomized experiments. The Review of Economics and Statistics, 100(4), 567–580. https://doi.org/10.1162/rest_a_00732 , , , , , & (2018b).