Whilst the principle of proportionality indisputably plays a crucial role in the protection of fundamental rights, it is still unclear to what extent it applies to other fields in international law. The paper therefore explores the role it plays in selected fields of public international law, beyond human rights. The examination begins in the classical domain of reprisals and in maritime boundary delimitation and continues to analyse the role played in the law of multilateral trade regulation of the World Trade Organization and in bilateral investment protection. In an attempt to explain differences in recourse to proportionality in the various fields, we develop in our conclusions a distinction between horizontal and vertical constellations of legal protection.
Trade, investment and migration are strongly intertwined, being three key factors in international production. Yet, law and regulation of the three has remained highly fragmented. Trade is regulated by the WTO on the multilateral level, and through preferential trade agreements on the regional and bilateral levels-it is fragmented and complex in its own right. Investment, on the other hand, is mainly regulated through bilateral investment treaties with no strong links to the regulation of trade or migration. And, finally, migration is regulated by a web of different international, regional and bilateral agreements which focus on a variety of different aspects of migration ranging from humanitarian to economic. The problems of institutional fragmentation in international law are well known. There is no organizational forum for coherent strategy-making on the multilateral level covering all three areas. Normative regulations may thus contradict each other. Trade regulation may bring about liberalization of access for service providers, but eventually faces problems in recruiting the best people from abroad. Investors may withdraw investment without being held liable for disruptions to labour and to the livelihood and infrastructure of towns and communities affected by disinvestment. Finally, migration policies do not seem to have a significant impact as long as trade policies and investment policies are not working in a way that is conducive to reducing migration pressure, as trade and investment are simply more powerful on the regulatory level than migration.
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