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1.9
(Usages and practices)

(1) The parties are bound by any usage to which they have agreed and by any practices which they have established between themselves.
(2) The parties are bound by a usage that is widely known to and regularly observed in international trade by parties in the particular trade concerned except where the application of such a usage would be unreasonable.


Author Title Publisher
BONELL, M.J. An International Restatement of Contract Law. The UNIDROIT Principles of International Commercial Contracts (3d ed) Transnational Publications Inc., Ardsely, New York, 2005, at 97-102
FERRI G. B. Il ruolo dell'autonomia delle parti e la rilevanza degli usi nei Principi UNIDROIT Bonell M.J. / Bonelli F. (eds.), Contratti commerciali internazionali e Principi UNIDROIT, Giuffré, Milano 1997, 123-141
GAMA Jr. L. Les usages du commerce dans les Principes d’UNIDROIT Eppur si muove: The Age of Uniform Law Essays in honour of Michael Joachim Bonell to celebrate his 70th birthday, vol. 2, 1412 ff.
LANDO O. The Role of Party Autonomy and the Relevance of Usages Bonell M.J. / Bonelli F. (eds.), Contratti commerciali internazionali e Principi UNIDROIT, Giuffré, Milano 1997, 107-122
PAMBOUKIS Ch., The concept and function of usages in the United Nations convention on the international sale of goods in: The Journal of Law and Commerce, Vol. 25, Issue 1, 2005, pp. 107-131
VOGENAUER, S. General Provisions III: Arts. 1.6-1.12 - Application of the PICC in S. VOGENAUER (ed.), Commentary on the UNIDROIT Principles of International Commercial Contracts (PICC), 2nd ed., Oxford University Press, Oxford, 2015, 180- 251
VOGENAUER, S. Comment to General Provisions: Arts 1.6-1.9,pp.140-201 in S.VOGENAUER - J.KLEINHEISTERKAMP, Commentary on the UNIDROIT Principles of International Commercial Contracts (PICC),Oxford University Press, New York, 2009