For best experience please turn on javascript and use a modern browser!

Stability and Change in International Customary Law

Event details of March 21, 2005: Francesco Parisi (George Mason University School of Law)
Date 21 March 2005
Time 11:45 -13:15


While customary law is capable of creating universally binding rules, the rules that govern its formation allow states to gain an exemption from emerging norms of customary law by remaining persistent objectors. This form of objection requires the objecting state to take express action to oppose an emerging practice by making its objections widely known before the practice solidifies into a binding rule of custom. Likewise, after the custom is formed states have an opportunity to express an objection or depart from it. In this latter case, the departing state does not obtain an exemption from the binding custom unless other states acquiesce to its departure. We model the effects of persistent objector and subsequent objector doctrines in the formation and change of customary law when heterogeneous states are involved.


Oudemanhuispoort 4-6
1012 CN Amsterdam