13.Liberalism, which was the predominant philosophical stream in the eighteenth century, brought new ideas incompatible with the harsh and restrictive application of rebus sic stantibus as provided by the canonists. Pacta sunt servanda, on the other hand, was perfectly coherent with the concept of lasse faire, lassez passe. Therefore, the codes that were enacted in this period (Napoleon's code and the Italian Civil Code) did not and would not adopt rebus sic stantibus.