In short, all of us in the industry made a fundamental underwriting mistake by focusing on experience, rather than exposure.”

• The muscles of portfolio construction and valuation atrophy, as consensus-driven ‘access’ dominates behavior and idiosyncratic risk falls out of favour.


• The typical ‘power law’ distribution of outputs collapses as few genuine outliers can be realised from a concentrated pattern of investment.


• As returns converge on a mediocre market-rate, investors

If you are a professional and have confidence, then I would advocate lots of concentration. For everyone else, if it’s not your game, participate in total diversification. If it’s your game, diversification doesn’t make sense. It’s crazy to put money in your twentieth choice rather than your first choice. . . . [Berkshire Vice-Chairman] Charlie [Mu