Thinking, Fast and Slow — Daniel Kahneman (2011)

Thinking, Fast and Slow transforms decision-making by exposing the cognitive biases that distort every judgment, from loss aversion to the planning fallacy. Kahneman's research, which earned him a Nobel Prize, is backed by decades of experiments showing that humans rely on intuitive System 1 thinking 95% of the time, often leading to systematic errors. This book outperforms #6 Deep Work by providing a universal toolkit for rationality, applicable to finance, parenting, and business—not just professional focus. It demonstrates that understanding mental shortcuts like the availability heuristic can reduce financial mistakes by up to 30%, making it a data-led guide to smarter choices.