Richard Thaler has spent much of his life studying and teaching things that were obvious to a grandmother but not to an economist – and that’s not a joke. The penchant for questioning established thinking struck him after he read a summary paper published by Daniel Kahneman and Amos Tversky titled, Judgment Under Uncertainty: Heuristics and Biases as a PhD student at the University of Rochester. That paper had his “heart pounding the way it might during the final minutes of a close game” confesses Thaler, who went on to do some great work with the duo thereafter. As Thaler makes us realise how obvious and easy the answers to most of the questions we pose to him are, he recalls his fondest memories working with Kahneman and Tversky. His camaraderie with Kahneman is perhaps to do with the fact that the two look at life from opposite ends: Thaler is a self-proclaimed eternal optimist, while Kahneman is a proud pessimist. “Danny claims that if you are a pessimist, life never disappoints you.” But I say, “He has the worst of all worlds. Every day he thinks that the world is going to end. It doesn’t end, so he should be happy but he has a new thing to worry about. So he is never happy. I am an optimist, but he thinks I’m a fool,” he concludes with a childish grin.