? In his "Prime ricerche sulla rivoluzione dei prezzi in Firenze" (1939), Giuseppe Parenti, by Fernand Braudel regarded as an author who "se classait, d'entree de jeu et sans discussion possible, a la hauteur meme d'Earl Jefferson Hamilton..." begins his opening lines with a description/de?nition of the price revolution which took place in the XVI in Europe as "that extraordinary enhancement of all things that occurred in European countries around the second half of the XVI; revolution in the true meaning of the word, as not only, like any strong price increase, it modi?ed the wealth distribution process and changed the relative position of the various social categories and of the different functions of the economic activity, but affected too, in a way that was not enough studied yet, the relative evolution of the various national economies, and ?nally, ..., certainly contributed to the birth, or at least to the dissemination, of the new naturalistic economic ideas, from which the economic science would have sprung". De?nition that can be taken as the founding metaphor of this volume.