This comprehensive Research Handbook examines the continuum between private ordering and state regulation in the lex mercatoria. It highlights constancy and change in this dynamic and evolving system in order to offer an in-depth discussion of international commercial contract law. International scholars, from a range of jurisdictions and legal cultures across Africa, North America and Europe, dissect a plethora of contract types, including sale, insurance, shipping, credit, negotiable instruments and agency, against the backdrop of key legal regimes commonly chosen in international agreements. These include: the UN CISG, Unidroit PICC, European DCFR and English law. The Research Handbook examines key general principles in commercial contract law, such as interpretation, good faith, remedies for breach and choice of law clauses from an international perspective. It also engages with various emerging aspects of internet contracting, including smart contracts. Scholars and researchers working in the field of contract law, and international commercial contracts more specifically, will find this Research Handbook to be an indispensable guide. Practitioners seeking clear guidance will also benefit from its detailed coverage of specific research questions.