Contributor(s): Professor Cass R. Sunstein | How does social change happen? Why is it so hard to anticipate? A key reason is the existence of hidden preferences, which may or may not be unleashed. Cass R. Sunstein (@CassSunstein) is currently the Robert Walmsley University Professor at Harvard. From 2009 to 2012, he was Administrator of the White House Office of Information and Regulatory Affairs. He is the founder and director of the Program on Behavioral Economics and Public Policy at Harvard Law School. His latest book is How Change Happens. To pre-order a copy of How Change Happens, which can be collected from independent bookshop Pages of Hackney at the event, please go to How Change Happens. Paul Dolan (@profpauldolan) is Professor of Behavioural Science at the London School of Economics. He is Head of Department in Psychological and Behavioural Science and Director of the EMSc in Behavioural Science. He is author of the Sunday Times best-selling book Happiness by Design, and Happy Ever After. The Department of Psychological & Behavioural Science (@LSE_PBS) is a growing community of researchers, intellectuals, and students who investigate the human mind and behaviour in a societal context. Our department conducts cutting-edge psychological and behavioural research that is both based in and applied to the real world. Twitter Hashtag for this event: #LSEHowChangeHappens This event forms part of the “Shape the World” series, held in the run up to the LSE Festival, a week-long series of events taking place from Monday 2 to Saturday 7 March 2020, free to attend and open to all, exploring how social sciences can make the world a better place. The full programme will be available online from January 2020. Video The recording of the Facebook Live of this event is available to watch at How Change Happens. Podcasts and videos of many LSE events can be found at the LSE Public Lectures and Events: podcasts and videos channel.