3. กฎหมายพาณิชย์ is, in the conception of some writers, the law that applies to foreign investment contracts. During periods of การแพร่หลายไปทั่วโลก,
รูปแบบ การทำสัญญา used within industries are imitated and uniform laws grow up in relation to them, facilitating the idea of a transnational law. As arbitral awards come to be made interpreting contractual terms and writingsbased on them grow, the law becomes concrete. (M. Sornarajah, The International Law on Foreign Investment, (3rdedn. Cambridge University Press, Cambridge 2010. at p38)