Indeed, international law may grow in a way similar to municipal law: establishing basic property rights and rules of security first and turning to creation of public goods and regulatory purposes later. As Wolfgang Friedmann explained, early international law only needed to be concerned with the right to territory, the commencement and conduct of war, and the treatment of emissaries. These were the requirements in a world where there were few ผลกระทบภายนอก or public goods worth addressing, and in which most cooperation problems could be addressed through ad hoc and informal diplomacy. Under more interdependence, greater international law becomes functionally useful. It is clear that a static vision of the structure and function of the international legal system would be ignorant of this dynamism. Moreover, as the needs addressed by international law grow and its functions broaden, structural changes become appropriate