IL54: Why Smart Investors Keep Making Crazy Decisions ft. Alex Edmans

Market psychology significantly influences asset prices, often overriding fundamental economic data. Alex Edmans, a finance professor at London Business School and author of *The Madness of Markets*, demonstrates that emotional states—ranging from national moods following sporting losses to the valence of popular music—correlate with stock and bond market movements. While professional investors often face career risks and benchmark constraints, individual investors can leverage their long-term time horizons to exploit these behavioral biases. Effective decision-making requires mitigating confirmation bias and the disposition effect through practices like writing down specific investment rationales, establishing clear "kill criteria" for trades, and avoiding excessive portfolio monitoring. By identifying "big market delusions," such as the overvaluation of entire industries like electric vehicles or AI, investors can better navigate market irrationality and maintain a disciplined, long-term approach to wealth accumulation.