Plain-English investing notes, one idea at a time — every number checked against a primary source.

Topic

Investor behavior: the mistakes we make with our own money

Many investing problems are not about products at all — they are about how people react to losses, headlines and other people's gains.

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Many investing problems are not about products at all — they are about how people react to losses, headlines and other people's gains. These notes explain loss aversion, overconfidence and herding with evidence from regulators and published research, show why timing the market is harder than it looks, offer a way to read financial news without overreacting, and list the red flags of investment fraud that regulators warn about most often. Knowing these patterns will not make anyone immune, but it makes them easier to notice. The notes below are listed in reading order: start at the top, or jump straight to the question you have. Every note ends with its numbered sources.