What's the best book about behavioral mistakes in trading?
In one paragraph
Why Smart People Make Big Money Mistakes by Gary Belsky and Thomas Gilovich. It catalogs the specific cognitive errors that wreck individual investor returns — anchoring, loss aversion, mental accounting, recency bias — with concrete examples for each.
What this actually means
Behavioral finance is the most decisive single edge a retail investor can develop, because almost every market mistake is a behavioral mistake. Belsky and Gilovich's book is the cleanest catalog of the specific cognitive errors involved.
The book is organized by error type, each with the academic name, a plain-English description, and a stock-market example. Mental accounting (treating bonus money differently than salary money), loss aversion (selling winners to take a small gain but holding losers to avoid recognizing a loss), recency bias (assuming the last three months predict the next three), anchoring (refusing to sell a stock until it gets back to your purchase price), the endowment effect, sunk cost.
What makes the book useful as a trading book specifically: most of the errors map directly to specific trading actions a reader can self-recognize. After reading, a careful investor can audit their own portfolio — 'am I holding this loser because of anchoring? did I take that winner because of loss aversion?' — and the labels make the audit possible.
The Psychology of Money is the broader-frame companion. Housel covers similar behavioral ground but at the wealth-building level rather than the trade-execution level. The two books fit together.
Irrational Exuberance by Robert Shiller is the third book — Shiller's analysis of market-level bubble psychology is the macro version of the same behavioral errors playing out across millions of traders simultaneously. Useful context for recognizing what cycle the market is actually in.
