It has been perceived that States who entered into international investment agreements (IIAs) with arbitration clause risk being sued by foreign investors when they change legislation which causes negative impact on certain investments. However, a study by German and Dutch researchers have shown that foreign investors have very rarely used ISDS to seek damages due to legislative changes. Neither has ISDS been used to hamper introduction of a new law.
The study shows that most ISDS cases have targeted contracts between a State and foreign investors, or the rejection or modification of licenses. Another study by the Columbia Center on Sustainable International Investment, quoted in the German and Dutch study, shows that among all ICSID cases up to 2014, only 9% of cases dealt with legislation. Only half of the cases concerned government actions, and the rest dealt with decision-making by local governments and state-owned companies.
Previous claims under the North American Free Trade Agreement (NAFTA) for damages caused by legislative changes have all failed, according to the study. In a well-known case where investors brought a claim for damages allegedly caused by legislative changes, the recently-decided Philip Morris v. Australia, the investor’s claims were dismissed at an early stage.
In conclusion, studies have shown that it is very rare that foreign investors used ISDS to challenge States’ legislative powers in areas such as for example environment protection and public health. Instead, the study found that in the vast majority of cases, investors claim compensation on grounds that the State violated its concrete commitments in the form of contracts or licenses.