Compounding Knowledge
I wonder to what extent Warren Buffet is Warren Buffet because of how he thinks and acts (like all of these non-fiction authors selling books by using his name would have us believe), and to what extent he is the product of media selection bias.  -- If you take a large enough group of people who take risky stakes that are large enough (like the world of financial asset management), then one of them is bound to be as successful as Warren Buffet, even if they all behave randomly.