What distinguishes the practice-dependent approach to justice?

The practice-dependent approach to justice has received a lot of attention in post-millennium political philosophy. It has been developed in different directions and its normative implications have been criticized, but little attention has been directed to the very distinction between practice-dependence and practice-independence and the question of what theoretically differentiates a practice-dependent account from mainstream practice-independent accounts. The core premises of the practice-dependent approach, proponents argue, are meta-normative and methodological. A key feature is the presumption that a concept of justice is dependent on the function or aim of the social practices to which it is supposed to be applied. Closely related to this meta-normative thesis is an interpretive methodology for deriving principles of justice from facts about existing practices, in particular regarding their point and purpose. These two premises, practice-dependent theorists claim, differentiate their account since (1) they are not accepted by practice-independent accounts and (2) they justify different principles of justice than practice-independent accounts. Our aim in this article is to refute both (1) and (2), demonstrating that practice-independent accounts may indeed accept the meta-normative and methodological premises of the practice-dependent accounts, and that we are given no theoretical reason to think that practice-dependent accounts justify other principles of justice for a practice than do practice-independent accounts. In other words, practice-dependent theorists have not substantiated their claim that practice-dependence is theoretically differentiated from mainstream accounts. When practice-dependent proponents argue for other principles of justice than mainstream theorists, it will be for the usual reason in normative theory: their first-order normative arguments differ.