Anatoly_Vorobey comments on Causal Inference Sequence Part 1: Basic Terminology and the Assumptions of Causal Inference

[Anatoly_Vorobey]

However, the point I wanted to make is that you would have been able to come up with some mechanism described by graph 2 that could account for the data..

Thanks. I should have realized that, and I think I did at some point but later lost track of this. With this understood properly I can’t think of any counterexample, and I feel more confident now that this is true, but I’m still not sure whether it ought to be obvious.