 Interestingly, both Rosen and Wedgwood reject this reductive conclusion. Wedgwood argues that some necessary truths (including ethical supervenience theses) can be explained by certain contingent truths, together with facts about essences, and that this sort of explanation does not have reductive implications (2007, §9.3; for critical discussion of this response, see McPherson 2009, Sec 3, and especially Schmitt and Schroeder 2011). Rosen responds by rejecting the strong metaphysical supervenience of the ethical (see  Section 5.3  below).