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The notion of a free trade system encompassing multiple sovereign states originated in a rudimentary form in 16th century Imperial Spain. American jurist Arthur Nussbaum noted that Spanish theologian Francisco de Vitoria was "the first to set forth the notions (though not the terms) of freedom of commerce and freedom of the seas." Vitoria made the case under principles of "jus gentium". However, it was two early British economists Adam Smith and David Ricardo who later developed the idea of free trade into its modern and recognizable form.
16th century