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The Principle of Proportionality in International Law: Foundations and Variations

In: The Journal of World Investment & Trade
Authors:
Thomas Cottier World Trade Institute Bern Switzerland University of Bern Switzerland Thomas.Cottier@wti.org

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Roberto Echandi World Bank Group Washington, DC USA rechandi@ifc.org

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Rachel Liechti-McKee University of Bern Switzerland rachel.liechti@iew.unibe.ch

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Tetyana Payosova University of Bern Switzerland tetyana.payosova@iew.unibe.ch

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Charlotte Sieber University of Lucerne Switzerland charlotte.sieber@unilu.ch

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Originally based upon the principle of equity, proportionality is predominantly used in the field of human rights protection, the use of force and countermeasures, humanitarian law, maritime boundary law, trade law and investment protection. The article finds that components of proportionality are shared and variably applied in these areas. The main challenge relates to weighing and balancing of interests in judicial review, reflecting upon the varied status and authority of international tribunals. The article submits that proportionality or necessity in terms of assessing the relationship of means and end, seeking least intrusive measures, is well-established and qualifies as a self-standing rule of customary international law. It should be termed strict proportionality. However, the component of weighing and balancing interests amounts to a general principle of law and applies in context. It informs the interpretation of the law at hand and is subject to varying standards of review.

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