Article 4: Applicable Law in the Absence of Choice
(1) To the extent that the law applicable to the contract has not been chosen in accordance with Article 3, the contract shall be governed by the rules of law law of the country with which the case it is most closely connected. Nevertheless, a severable part of the contract which has a closer connection with other rules of law another country may by way of exception be governed by those rules of law the law of that other country.
(2) Subject to the provisions of paragraph 5 of this Article, it shall be presumed that the case contract is most closely connected with the country where the party who is to effect the performance which is characteristic of the contract has, at the time of conclusion of the contract, his habitual residence, or, in the case of a body corporate or unincorporate, its central administration. However, if the contract is entered into in the course of that party's trade or profession, that country shall be the country in which the principal place of business is situated or, where under the terms of the contract the performance is to be effected through a place of business other than the principal place of business, the country in which that other place of business is situated ...
(5) Paragraph 2 shall not apply if the characteristic performance cannot be determined, and the presumptions in paragraph[...] 2[...] shall be disregarded if it appears from the circumstances as a whole that the case contract is clearly more closely connected with another country.
2See, eg, ICC Case No 11754/2003 (2010) 21 ICC Bull Supp 20, 26 [32(4)]-decided under Art 17(1) ICC Rules 1998. See also ICC Case No 5717/1988 (1990) 1(2) ICC Bull22, 22; ICC Case No 5865/1989 (1990) 1(2) ICC Bull23, 23.
3See, eg, Nigel Blackaby and others, Redfern and Hunter on International Arbitration (6th edn, Oxford University Press 2015) 220 [3.203]; Klaus Peter Berger, International Economic Arbitration (Kluwer 1993) 503 (hereafter Berger, IEA); Peter Nygh, 'Choice of Forum and Law in International Commercial Arbitration' (1997) 24 Forum Internationale 1, 21; Marc Blessing, 'Choice of Substantive Law in International Arbitration' (1997) 14(2) Journal of International Arbitration 39, 54.
4Klaus Peter Berger, The Creeping Codification of the Lex Mercatoria (1st edn, Kluwer 1999) 289 [26].
11Born (n 1) 2656-58 [Gary Born, International Commercial Arbitration (2nd edn, Kluwer 2014)].
12ibid, 2659-61.
13William Prosser, 'Interstate Publication', (1952-53) 51 Michigan Law Review 959, 971.