[cat] El problema de la consideració de qualsevol interès com a usura i les formes per a evitar la condemna eclesiàstica foren uns dels principals temes econòmics i morals de l’Europa tradicional. Aquest paper mostra els orígens i fonaments de la doctrina eclesiàstica sobre la usura, l’aparición dels instruments comercials i financers que evitaven la condemna de l’església i les excepcions i noves doctrines que consideraven lícit el benefici procedent del préstec.

[eng] The problem of the consideration of any interest like usury and the ways to avoid the ecclesiastical condemnation were some of the main economic and moral topics of the traditional Europe. This paper shows the origins and foundations of the ecclesiastical doctrine on the usury, the appearance of the commercial and financial instruments that avoided the condemnation of the Church and the exceptions and new doctrines that considered warp the benefit coming from the loan.