Law, the Rule of Law, and Goodness-Fixing Kinds

Laws can be evaluated as better or worse relative to different normative standards. But the standard set by the Rule of Law defines a kind-relative standard of evaluation: features like generality, publicity, and non-retroactivity make the law better as law. This fact about legal evaluation invites a comparison between law and other “goodness-fixing kinds,” where a kind is goodness-fixing if what it is to be a member of the kind fixes a standard for evaluating instances as better or worse. Indeed, for any goodness-fixing kind, K, that sets a standard, S, for evaluating Ks as Ks, we can ask: (1) How does the nature of Ks explain S? (2) Does being a K depend on meeting a minimum threshold of S-relative goodness? In the case of law and its kind-relative standard defined by the Rule-of-Law virtues, these questions lack settled answers. Although Raz (1979, 2019) offers some discussion, I argue that his answers have the surprising upshot of rendering law sui generis relative to other goodness-fixing kinds, and that preserving continuity with other such kinds involves revising the general picture. On the revised picture, law construed as a system of rules is subject to kind-relative evaluation because it is (a) a functional artifact, (b) with an essential function of realizing a limited normative ideal, and (c) its being minimally good at that function—that is, its realization of the relevant normative ideal to some degree—is a condition and ground of law’s existence, since all functional artifacts appear to be subject to such threshold conditions.