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International Law’S Erie Moment, Harlan G. Cohen

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Who fills international law’s gaps? Whether over the meaning of bilateral investment treaties, the standards regarding detainee transfer, or the rules of non-international armed conflict, courts and states are increasingly in conflict over the authority to say what the law is. With international law’s increased judicialization, two competing visions of international law have emerged: One, a gap-filled international law, in which law is developed slowly through custom, argument, and negotiation, and a second, gap-less, in which disputes are resolved through a form of common law adjudication.

Drawing on growing literature on the law outside of courts, particularly out-of-court settlements, the …