 Leifer and Pusey (2017) (see also Leifer 2017 in  Other Internet Resources)  strengthen Price’s argument by showing that his assumption about the reality of (aspects of) the quantum state \(\psi\) can be relaxed. As they demonstrate, if measurement outcomes depend only on a system’s ontic state \(\lambda\), i.e., if that state completely mediates any correlations between preparation procedures and measurement outcomes (“\(\lambda\)-mediation”), this suffices for operational time-symmetry to entail the existence of retrocausality. Foundational accounts which like Bohmian mechanics (Bohm 1952a,b) or GRW-theory (Ghirardi, Rimini, &amp; Weber 1986) avoid postulating retrocausality do so by violating time-symmetry in some way. The GRW-theory does so by introducing explicitly time-asymmetric dynamics. In Bohmian mechanics the dynamics is time-symmetric, but the theory is applied in a time-asymmetric manner when assessing which quantum states are actually realized. Notably, one assumes that the quantum states of a measured system and a measurement device connected to it are uncorrelated prior to measurement, whereas they are in general correlated after measurement (Leifer &amp; Pusey 2017: §X.).