Louis Marchildon (Universite du Quebec)
Kastner (arXiv:1709.09367) and Kastner and Cramer (arXiv:1711. 04501) argue that the Relativistic Transactional Interpretation (RTI) of quantum mechanics provides a clear definition of absorbers and a solution to the measurement problem. I briefly examine how RTI stands with respect to unitarity in quantum mechanics. I then argue that a specific proposal to locate the origin of nonunitarity is flawed, at least in it present form.