Starting from Ouro Preto's Protocol (O.P.P.) it is certain that Mercosur has international legal subjectivity,' becoming in this respect an intergovernmental organization with international legal subjectivity.
Albarracin, Gabriel; Aguzin, Laura; and Degiorgio, Selva
"The Relationship Between The Laws Derived From The Organs Of Mercosur And The Legal Systems Of The Countries That Comprise Mercosur,"
ILSA Journal of International & Comparative Law: Vol. 4
, Article 4.
Available at: http://nsuworks.nova.edu/ilsajournal/vol4/iss3/4