The Behavior of Individual Investors
Read the paperopens papers.ssrn.com in a new tab
What they found
A comprehensive survey by the two leading researchers on retail investors, covering two decades of evidence from the U.S., Taiwan, Finland, Sweden, and elsewhere. They organize the evidence into performance (individuals underperform, especially active ones), trading behavior (overtrading, disposition effect, attention-driven buying, under-diversification, naive reinforcement learning), and the market effects of retail trading. They conclude that individual investors as a group lose to institutions, but that the losses are driven by a subset of active traders and identifiable behavioral patterns.
What you can use
- The best single overview of what the data says about retail trading; if you read one paper in this topic, read this one.
- The recurring findings across countries: overtrading, holding losers too long, chasing attention, and poor diversification.
- Losses are concentrated among the most active traders; passive individual investors do roughly fine.
Caveats
Survey with no new data; coverage ends around 2011, before commission-free apps and social-media-driven trading.
Tags: retail, survey, behavioral, beginner-friendly
Summaries are our own reading of the paper, not the authors' words. Educational only, not advice. Discuss it in Book Club.