Warning: Fast Driving May Lead to More Trading - New York Times:
"IF you get speeding tickets, watch out: The chances are good that you will also engage in possibly dangerous investing behavior, too. That is the implication of a new study that found that individuals who receive more speeding tickets tend to churn their portfolios.
The study, “Sensation Seeking, Overconfidence and Trading Activity,” has been accepted for publication by The Journal of Finance. The authors are Mark S. Grinblatt, a finance professor at the University of California, Los Angeles, and Matti Keloharju, a finance professor at the Helsinki School of Economics. A version is at http://www.anderson.ucla.edu/documents/areas/fac/finance/06-06.pdf."