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An Empirical Study on the Effectiveness of Non-Disputing State Party Submissions in ISDs

Clinic: National University of Singapore, Spring 2020


Executive Summary

(Full report can be read here)

Watch video here

This Memorandum analyses from an empirical perspective the prevalence of submissions made by Non-Disputing State Parties (“NDSPs”) and their influence on arbitral awards in Investor-State arbitration under investment treaties. The submissions studied for the purposes of this Memorandum are limited to those made by NDSPs, and not by other third parties. A summary of our key findings is set out below.

Part I – NDSP Submission Provisions: Treaty provisions providing for NDSPs to make submissions (“NDSP submission provisions”) to an arbitral tribunal can be found in 78 International Investment Agreements (“IIAs”), out of a total of 2577 IIAs surveyed. Such provisions are also found in four sets of arbitration rules (i.e. the UNCITRAL Rules on Transparency in Treaty-based Investor-State Arbitration 2014, the SIAC Investment Arbitration Rules 2017, the SCC Arbitration Rules 2017, and the CIETAC International Investment Arbitration Rules 2017). Notably, whilst NDSP submission provisions in IIAs and arbitration rules both allow for submissions on questions of treaty interpretation, the arbitration rules provide the tribunal with discretion to allow submissions on other issues related to the dispute.

Part II – NDSP Submissions in Investor-State Arbitration: As of the time of writing (i.e. 22 April 2020), and based on publicly available information, there have been 141 NDSP submissions made pursuant to 9 NDSP submission provisions, all of which have been under IIAs. The United States made the most NDSP submissions, followed by Mexico and then Canada. No State outside the Americas has made an NDSP submission. In this connection, NDSP submissions are most prevalent in NAFTA Chapter Eleven arbitrations, followed by CAFTA-DR Chapter Ten arbitrations, and then other Investor-State arbitrations commenced under various BITs to which either the United States or Canada is a party.

In addition, we observe that the content of most NDSP submissions directly corresponds to the stage of arbitration proceedings at which these submissions are made. What is more, States have generally been consistent in the positions they adopt both as NDSPs and as litigants in Investor-State disputes. Furthermore, consistency in the positions taken among treaty parties in their submissions appears to have resulted in the emergence of agreed interpretations of particular treaty provisions.

Part III – Weight accorded to NDSP submissions by arbitral tribunals: NDSP submissions are a means which treaty parties may use to demonstrate “subsequent agreement” or “subsequent practice”, which must be “taken into account” b