@article {603055, title = {Marginal Treatment Effects from a Propensity Score Perspective}, journal = {Journal of Political Economy}, volume = {127}, number = {6}, year = {2019}, pages = {3070-3084}, url = {https://www.journals.uchicago.edu/doi/10.1086/702172?mobileUi=0}, author = {Xiang Zhou and Yu Xie} }