Markets Never Forget (But People Do): How Your Memory Is Costing You Money—and Why This Time Isn’t Different

Sir John Templeton, legendary investor, was famous for saying, "The four most dangerous words in investing are, 'This time it's different.'" He knew that though history doesn't repeat, not exactly, history is an excellent guide for investors.

In Markets Never Forget But People Do: How Your Memory Is Costing You Money and Why This Time Isn't Different, long-time Forbes columnist, CEO of Fisher Investments, and 4-time New York Times bestselling author Ken Fisher shows how and why investors' memories fail them―and how costly that can be. More important, he shows steps investors can take to begin reducing errors they repeatedly make. The past is never indicative of the future, but history can be one powerful guide in shaping forward looking expectations. Readers can learn how to see the world more clearly―and learn to make fewer errors―by understanding just a bit of investing past.

KEN FISHER is the Founder, Executive Chairman, and Co-Chief Investment Officer of Fisher Investments, a $387-plus billion (as of 3/31/2026) investment adviser and money management firm serving large institutions and high-net-worth individuals. For over 32 years, Fisher wrote Forbes' "Portfolio Strategy" column, making him the longest continuously running columnist in the magazine's venerable history. He now writes monthly, native-language columns in over 25 major media organs worldwide, including the New York Post, Britain's Daily Telegraph, Spain's elEconomista and Italy's Il Sole 24 Ore. In total, his columns span more countries and more languages in more total reach than any other, non-syndicated columnist of any type ever.

LARA HOFFMANS is a content manager at Fisher Investments, managing editor of MarketMinder.com, a regular contributor to Forbes.com and co-author of the bestsellers, The Only Three Questions That Count, The Ten Roads to Riches, How to Smell a Rat and Debunkery.