Investor Due Diligence and Legitimate Expectations
Abstract This article examines the significance of investor due diligence in the context of a claim that a host State has breached its obligation to provide fair and equitable treatment (FET). Despite increasing reliance on due diligence exercises, there are considerable differences in how tribunals understand and use such exercises. These differences are related to different visions of the function and future of international investment law. After exploring the different approaches that are taken, this article will argue that the most coherent approach is to treat investor due diligence as merely a technique for assessing investor reasonableness and prudence, rather than a strict requirement.