Behavioural economics have become an ever more trendy way of explaining the crisis. In this debate speakers demystify the subject and do battle on the merits of its approach and usefulness. The speakers are: Leigh Caldwell chief executive, Inon; Professor Emre Ozdenoren associate professor of economics, London Business School; Dr Stuart Derbyshire senior lecturer, School of Psychology, University of Birmingham and Dr Michael Savage investment banker and writer, financial economics and development.