 It is not obvious that this argument succeeds. We all have an obvious and powerful interest in many personal relationship goods—especially in those that are necessary for survival, health and autonomy—any yet it is often unclear who is under the duty to satisfy the interest. So, the question is whether the existence of a right requires a priorly specified duty and duty-bearer. Some (Cowden 2012a, b) assume a positive answer, while others (Brighouse &amp; Swift 2014; Brownlee 2013) believe this is not necessary on an interest theory of rights. If rights are grounded in powerful interests that can be satisfied without imposing disproportionate burdens on others, it is possible to identify them prior to having in place a system that allocates correlative duties to particular individuals.