Variations on Equity and Related Concepts

Abstract

The chapter analyses variations on equity and related concepts that originate in equity. In particular, it studies equality, reasonableness, estoppel, acquiescence, good faith, unjust enrichment, the clean hands doctrine, abuse of rights, and proportionality. The chapter probes these concepts to demonstrate that equity lies deep in the international law mainstream and is applied even if we are not constantly aware of this. The chapter further aims to topple the myth that some forms of equity, notably contra legem equity, are only applied if the parties agree. It suggests that some such variations on equity or equitable principles, notably the clean hands doctrine and abuse of rights, can be seen as permissible applications of contra legem equity without the parties’ agreement – with the caveat that equity cannot truly exist contra legem.