On the Use and Abuse of Necessity in the Law of State Responsibility
Necessity, necessità, is Machiavelli’s guiding principle . . . that infringing the moral law is justified when it is necessary.Thus is inaugurated the dualism of modern political culture, which simultaneously upholds absolute and relative standards of value. The modern state appeals to morality, to religion, and to natural law as the ideological foundation for its existence. At the same time it is prepared to infringe any or all of these in the interest of self-preservation.—J. M. CoetzeeRecent jurisprudence in investment arbitration, almost all of which originated in disputes arising out of Argentina’s turn-of-the-century fiscal crisis, has raised difficult questions about the existence, nature, and advisability of necessity as a defense to state responsibility. The jurisprudence has contributed to a sophisticated literature focusing on necessity’s role in the special context of investment arbitration. But the growing prominence of necessity pleas in international law has not been so limited. Nor will its effects be. In the first place, investor-state arbitral jurisprudence contributes to the evolution of general international law. Investment tribunals invoke the latter, for example, to inform their interpretation of bilateral investment treaties (BITs) or to cure lacunae in the law. More significantly, beyond the realm of investment arbitration, the past few decades have seen a striking growth in necessity pleas in fields ranging widely across the landscape of international law.