I recently gave a talk at the American Association of Individual Investors, and again at a Motley Fool gathering in Toronto. Below are the slides I used in the talks. (I removed a few that would have been too confusing without context.)
The theme of the talk is simple. Most investors underperfom a basic benchmark like the S&P 500 (^GSPC 0.38%). To me, that fact has always emphasized two points: That markets and the economy work far differently than we assume, and figuring out what makes people bad investors is a more important topic than what makes a good investor.