IE:DPC, Ch04: Examples of Non-Randomized Treatment Causing Problems
Channel: David Kaplan
Date: 10/12/2022

Examples where the treatment variable is related to the outcome variable through channels besides the treatment effect on the outcome, like through a third "confounder" variable that affects both treatment and outcome.  (And consequently the ATE is not identified by the simple difference of means.)
Textbook (IE:DPC) "Introductory Econometrics: Description, Prediction, and Causality"
https://kaplandm.github.io/teach.html
https://www.themizzoustore.com/p-236916-introductory-econometrics-description-prediction-and-causality.aspx