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Enabling Private Ordering - the University of Minnesota Law School

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2009] UMBRELLA CLAUSES 23<br />

2. Limited Protection <strong>of</strong> Investor-State Contracts under<br />

Customary International <strong>Law</strong><br />

The concept <strong>of</strong> State sovereignty also limits <strong>the</strong> power <strong>of</strong><br />

customary international law to stabilize investor-State contracts<br />

ex post. What is primarily lacking in this context is a procedural<br />

remedy for investors to hold host States accountable in an<br />

international forum. Instead, under <strong>the</strong> dualist conception <strong>of</strong><br />

international law <strong>the</strong> relationship between foreign investors and<br />

host States is mediated through an inter-State prism that<br />

requires investors to seek diplomatic protection on <strong>the</strong><br />

international level through its home State. This structure is<br />

generally insufficient because <strong>the</strong> inter-State settlement <strong>of</strong><br />

investment disputes between <strong>the</strong> investor’s home State and <strong>the</strong><br />

host State does not represent an adequate replacement for<br />

dispute resolution directly between <strong>the</strong> foreign investor and <strong>the</strong><br />

host State. Apart from this procedural aspect, customary<br />

international law is also limited as regards <strong>the</strong> substantive<br />

protection <strong>of</strong> investor-State contracts and similar forms <strong>of</strong><br />

investor-State cooperation.<br />

a. Insufficiencies <strong>of</strong> Diplomatic Protection as an Enforcement<br />

Mechanism<br />

International law in its positivist reading as ius inter gentes<br />

posited that “[s]tates solely and exclusively are <strong>the</strong> subjects <strong>of</strong><br />

International <strong>Law</strong>. This means that <strong>the</strong> <strong>Law</strong> <strong>of</strong> Nations is a law<br />

for <strong>the</strong> international conduct <strong>of</strong> States, and not <strong>of</strong> <strong>the</strong>ir<br />

citizens.” 46 Obligations under international law could <strong>the</strong>refore<br />

not exist directly in relation to a foreign investor. Instead, <strong>the</strong><br />

investor was originally considered to be subject only to <strong>the</strong><br />

municipal law <strong>of</strong> <strong>the</strong> host State. 47 Accordingly, a breach <strong>of</strong> <strong>the</strong><br />

host State’s promises was first and foremost a matter <strong>of</strong><br />

municipal law and did not find its direct corollary in<br />

international law. The paradigmatic idea underlying customary<br />

international law was ra<strong>the</strong>r that <strong>the</strong> violation <strong>of</strong> certain<br />

interests <strong>of</strong> foreign nationals through certain government<br />

actions, such as expropriatory or arbitrary conduct, 48 constituted<br />

a violation against <strong>the</strong> alien’s home State.<br />

46. OPPENHEIM’S INTERNATIONAL LAW, supra note 3, § 13, at 18–19.<br />

47. Attempts at <strong>the</strong> internationalization <strong>of</strong> investor-State relations only came<br />

about at a later stage. See Weil, supra note 3, at 157–88.<br />

48. See infra Part II.B.2.b (discussing <strong>the</strong> types <strong>of</strong> State conduct that<br />

international law targeted).

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