Filadelfia – “Human resources and productivity: the impact of the personnel flow” is the title of the essay written by Luca Solari, Professor of Business Organization at the Department of Social and Political Sciences of the University of Milan, who won the international prize of the Academy of Philadelphia, the largest association of management scholars in the world. The essay, written with Edoardo Della Torre, a researcher from Bergamo, Chris Zatzick and David Sikora from California Polytechnic State University, was selected as the best paper by the HR division of the Academy from over 600 essays by the most important research scholars at the international level. Using the survey on the labor market ordered by Confindustria and conducted by the research center of Assolombarda on a sample of 1,960 Italian enterprises, Professor Solari managed to demonstrate the impact of the turnover on SMEs productivity. (9colonne)