Yes, the Dennis's test was a good idea.
However I'm not sure if he had proved smth. He ended with 20 hand-picked "students" of 1000 applicants plus 3 guys by recommendation. It is only 2% of people who applied. I wonder how Dennis distributed his advertisement about his program, had everybody in the USA chance to read it and apply? Anyhow, these 2% is much less than percenate of successful traders on forex which is widely considered to be 10%.
The "Trading Places" movie looks more "pure" experiment for me
