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We are grateful for the opportunity to provide a discussion on this paper. We will first focus on the general context. Next, we will emphasize the novel key ideas proposed by the authors before formulating some open questions.
With multiple possible mediators on the causal pathway from a treatment to an outcome, we consider the problem of decomposing the effects along multiple possible causal path(s) through each distinct mediator. Under a path‐specific effects framework, such fine‐grained decompositions necessitate stringent assumptions, such as correctly specifying the causal structure among the mediators, and no unobserved...
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