The parties always have to act according to what is reasonable in view of the particular nature of their transaction and the circumstances involved, in particular the economic interests and expectations of the parties.
Doctrine
Berger, Klaus Peter, The Creeping Codification of the Lex Mercatoria, The Hague, London, Boston 1999Berger, Klaus Peter, The Creeping Codification of the New Lex Mercatoriam 2nd. ed. 2010Domingo, Ortega, Rodriguez-Antolin, Zambrana, Principios de Derecho Global, Navarra, 2006Ferrari, Franco, Das Verhältnis zwischen den Unidroit-Grundsätzen und den allgemeinen Grundsätzen internationaler Einheitsprivatrechtskonventionen, JZ 1998, at 9 et seq.Ferrari, Franco, The CISG's Interpretative Goals, Its Interpretative Method and Its General Principles in Case Law (Part II), IHR 5/2013, at 181 et seq.Joachim, Willi E., The "Reasonable Man" in United States and German Commercial Law, 15 Comp.L.Yb.Int'l Bus. 1992, at 341 et seq.Jones, Peter, Reasonableness, Honesty and Good Faith, International Sales Quarterly, March 1995, at 8 et seq.Langen, Eugen, Transnationales Recht, Heidelberg 1981.Magnus, Ulrich, Die allgemeinen Grundsätze im UN-Kaufrecht, 59 RabelsZ 1995, at 469 et seq.Schlechtriem, Peter, Internationales UN-Kaufrecht, Tübingen 1996Tully, Stephen R., 'Objective Reasonableness' as a Standard for International Judicial Review, Journal of International Dispute Settlement, 2015 at Page 546 et seq.Court Decisions
Euroption Strategic Fund Limited v. Skandinaviska Enskilda Banken AB, [2012] EWHC 584 (Comm)Socimer International Bank Limited (in liquidation) v Standard Bank London Ltd, [2008] EWCA Civ 116Arbitral Awards
ICC Award No. 2291, Clunet 1976, at 989 et seq.Principles / Restatements
Principles of European Contract Law - PECLUNIDROIT Principles of International Commercial Contracts 2016