Thank you Mark, Modern Portfolio Theory, now I remember reading about it on SI. That would have been shortly after the AIM convention. I am very interested were it brings you (and us).
My own idea has single stocks as its focus. What happens to the Sharpe ratio (or something like it) of an investment when you AIM it? I have some ideas, but need to get a bit more information, and to set up backtests.
But first, a long weekend Paris with my wife!
See you all,
Karel