Fabrizio Perretti, Bocconi University (IMAGE) Bocconi University Caption This is Fabrizio Perretti, Bocconi University, co-author. Credit Paolo Tonato Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.