How can one person’s having political power over another be justified? This essay explores the idea that such justifications must be in an important sense derivative, and that this ‘Derivative Justification Constraint’ bars certain justifications widely endorsed in political and philosophical debates. After critically discussing the most prominent extant articulations of the Constraint (associated with a view often called ‘political instrumentalism’), the essay offers a novel account of what precisely the Constraint bars (in short: justification by appeal to non-derivative goods (...) that include among their elements one person’s ruling over another), what motivates it (in a nutshell: a deeply non-instrumental concern for each person’s moral independence), and what it entails for how we may justify democratic political arrangements in particular. (shrink)