Investment treaty arbitration, unlike commercial arbitration, is not a purely private dispute settlement mechanism that is entirely subject to party autonomy and limited in its effects to the parties to the proceedings. Rather, it fulfils a public function in influencing the behaviour of foreign investors, states, and civil society more generally by crafting and concretizing international standards of investment protection. Investment treaty arbitration thus implements and operates as part of a public system of investment protection. Arbitrators, as a result, incur obligations not only towards the parties to the proceedings, but vis-à-vis the whole system of investment protection. These obligations can be conceptualized as part of the public law implications of investment treaty arbitration and affect, inter alia, the role and status of arbitrators in investment treaty disputes, the procedural maxims that such arbitrations should follow, and the way arbitral awards should be crafted.
