The Inseparability of Rights and Duties

On rights and duties by James Otteson:

The test of whether one has a “right” to something is whether someone else has a duty to provide it. The two—a right and its correlative duty—are logically inseparable; like mountain and valley or ebb and flow, one exists only with the other. Hence if no one has a duty to provide you something, you have no right to it; and you can claim a right to something only if it is someone else’s duty to provide it for you.