Regulatory Coherence Requirements in Investment Treaty Arbitration
Part IV comprises two chapters, Chapter Seven and Chapter Eight. These chapters focus on investment treaty arbitration. Chapter Seven identifies the regulatory coherence tests emerging under each of the core investment protection guarantees. Fair and equitable treatment guarantees require host States’ regulatory measures to bear reasonable relationships to rational policies. National treatment guarantees call for a reasonable nexus to a rational government policy. The law on expropriation increasingly incorporates the understanding that reasonable measures adopted in good faith to address a real public health or environmental concern are ‘for a public purpose’. These tests all tend to accommodate domestic level decision-making, allowing room for the operation of democratic processes rather than envisaging an international legal override. This will assist with traditional procedural justifications for authority at the domestic and international level.