 How rights become imbued with this special normative force is a matter of ongoing scholarly inquiry. As Sreenivasan (2010) notes, a Hohfeldian claim-right in itself only entails the existence of a duty with a certain structure, and not a duty with a certain force. A has a claim against B if and only if B has a duty to A: in this definition it is the “direction” of B’s duty (that it is owed to A) which correlates B’s duty to A’s right; nothing is said in the definition about the duty’s strength. Why “directed duties”—as above, those owed to an entity—have greater normative priority remains an open question: the only broad consensus is that they do. (See Thompson 2004 on “bipolar” judgments.)