Chapter 5 The temporal scope of application of investment treaties and the effects on general international law
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The temporal scope of application constitutes one of the most crucial elements of treaty law. While the stages of the life of a treaty - from the moment of its adoption until the end of its legal consequences - depend on the will of the parties, the exercise of such will is embedded in an objective regime governing the legal effects and consequences of each stage. The interplay between treaty-specific provisions determining the temporal scope of application of a specific agreement and the general law of treaties has particular relevance in the field of investment law. This contribution examines whether investment law (jurisprudence) provides answers to open questions of the general law of treaties relating to the temporal scope of application. The structure of the paper follows the relevant moments in time for a treaty, i.e. its entry into force, its life prior to entry into force by virtue of a treaty's provisional application, and its 'end of life', particularly following mutual termination. Focus is placed on those cases which have the most to offer with regard to the general law of treaties, i.e., the question of the reach of an openly formulated dispute settlement clause, both with regard to preexisting disputes as well as continuing or composite acts, and the legal effects of provisional application. Moreover, as a special feature of investment law related to the 'end of life of a treaty', the cancellation of so-called 'sunset clauses' is explored from the perspective of the general law of treaties. In a final part, the effects of these developments on general international law are discussed.

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