Im not a Warren nut hugger,but he made that claim,and he wasnt referring to private equity deals.He was talking small cap..
And I still disagree with him. As I said, this isn't like it was 40-50 years ago. Everyone is pretty much on a level playing field in terms of information, and you have algos that make things both more difficult and much more efficient. You can't just handpick small stocks that "Wall Street doesn't know about yet" any more.
FWIW,he made the statement in 1999..
Great wealth came from concentration, not diversification. I am quite sure Mr. Dalio made concentrated bets/strategies to amass his wealth, similar to Mr. Buffett. Then both diversified.
It is also survivor bias. We don't hear from losing Buffett's about how they concentrated their bet and lost.
For us plebs, diversification is the way to go to amass a comfortable retirement fund at low risk.