Second edition of a year after the original, of this work of great importance in the area of & nbsp; & nbsp; debate on usury in the eighteenth century. Maffei declared an interest on money loans lawful, becoming an advocate of the liberal theses typical of Protestant countries. He was immediately condemned by the ecclesiastical authorities. In this second edition Maffei took a softer position having Benedict XIV, the dedicatee of the work, in the meantime published the famous encyclical "Vix pervenit", which condemned the practice of usury.