Rationality and Money

Why are humans willing to lose money in order to win revenge? Has that instinct had a role in the economic crisis? Hear the insights of behavioural guru Dan Ariely. Robert Peston reports on the millions of Chinese homes which are lying empty. Nessa Tierney reports on Ireland's commedy and economics festival. And Professor Yanis Varoufakis, from the University of Athens, talks about the impact of Greece's austerity cuts.