Jay Thatcher
Cognitive biases shape the prices you accept, the people you trust, and the plans you make. This book explains 50 of them in plain language, with the research behind each one and steps you can use to catch them before they cost you. The biases are grouped into nine chapters by the situation where they tend to appear, so you can read straight through or go directly to the problem in front of you. Each chapter stands on its own. Each entry follows the same pattern: a clear definition, the original studies, real cases, and specific countermeasures. The nine chapters work through: - Mental shortcuts, including anchoring, the availability heuristic, and base rate neglect - Chance and risk: the gambler’s fallacy, the hot-hand fallacy, zero-risk bias, and survivorship bias, which explains why studying only successful companies teaches the wrong lessons - How beliefs form and resist correction: confirmation bias, the ostrich effect, and the illusory truth effect - Self-perception, with a careful look at overconfidence, optimism bias, and the Dunning-Kruger effect, including where researchers still disagree about it - Misreading other people’s motives - Group pressure, groupthink, and deference to authority - Memory distortions such as hindsight bias, the misinformation effect, and the peak-end rule - Loss aversion, the sunk cost fallacy, framing, and the decoy effect - Time and planning errors, including present bias and the planning fallacy behind projects like the Sydney Opera House, which opened a decade late and roughly 14 times over budget The studies are memorable. Experienced German judges rolled loaded dice before sentencing a shoplifter, and those who rolled a 9 handed down about three more months than those who rolled a 3. People who heard that cars 'smashed' into each other later remembered broken glass that never appeared on film. Every chapter ends with questions that ask you to apply the ideas to your own decisions, and example responses at the back let you check your reasoning. You also get: - A historical timeline running from Francis Bacon to Kahneman and Tversky - A glossary of terms - A reference list of original studies - Recommended readings for further study This book suits students in psychology, economics, and behavioral science, managers and investors who make costly decisions, and curious readers who want to understand why smart people make predictable errors. The writing assumes no background in statistics. Knowing the names of biases won’t make you immune to them, and the book says so directly. What it gives you instead are tested habits, such as the premortem and checking how long similar projects took, that catch errors effort alone misses. Each takes a few minutes and works best on expensive decisions that are hard to undo. Read one bias a week and you will start spotting it in negotiations, news coverage, and your own choices.
