 Most often those disputes are decided by arbitrators which sometimes are allowed (explicitly of implied) to apply "lex mercatoria" principles.Therefore, some legal practitioners assume that there is a whole set of legal principles named ""lex mercatoria"" in international or transnational commercial law.The most recent and constantly updated set of rules are the "TransLex Principles" collected and formulated by Klaus Peter Berger (University of Cologne) and his Center for Transnational Law.