  We argue that the concepts of "freedom of choice" and of "causal order" are
intrinsically linked: a choice is considered "free" if it is correlated only to
variables in its causal future. We discuss the implications of this to
Bell-type scenarios, where two separate measurements are carried out, neither
of which lies in the causal future of the other, and where one typically
assumes that the measurement settings are chosen freely. Furthermore, we refute
a recent criticism made by Ghirardi and Romano in [arXiv:1301.5040] and
[arXiv:1302.1635] that we used an unphysical freedom of choice assumption in
our previous works, [Nat. Commun. 2, 411 (2011)] and [Phys. Rev. Lett. 108,
150402 (2012)].
