The past two decades have seen a significant proliferation of trade and investment treaties around the world. States are increasingly negotiating agreements that regulate both trade and investment, such as the Trans-Pacific Partnership Agreement and the Transatlantic Trade and Investment Partnership. The number of investor-state dispute settlement cases is growing dramatically each year, yet states' enthusiasm for investor-state arbitration has become more qualified as concern has intensified that the system can be abused by foreign investors. Good faith is therefore becoming increasingly...