This article describes the years of Goodwin’s ‘third life’ at the University of Siena, stressing in particular his main contributions to economic theory, the evolution in his political and philosophical ideas and his love of art. First, after a brief description of his arrival in Siena and...

Starting from a new continuous-time non-linear dynamic model of the exchange rate, we formally show that the introduction of a Tobin tax reduces speculators’ prot and inuences the dynamics of the system making it more stable and less prone to chaotic motion.