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“If we don’t quite know what the future holds, there is little point in getting carried away by very fancy mathematical calculations of optimal portfolios. Don’t rely on past data to be a good guide. Try to think through what mix of assets gives you the best chance of surviving some big event. That must mean including assets that are negatively correlated or uncorrelated in your portfolio. And I am very struck by the fact that over many many years, central banks, governments and individuals have always, despite the protestations of economists, held some gold in their portfolio. Obviously, there is no high running return, but when unexpected things happen, particularly when governments rise and fall, then gold is a means of payment that everyone is always prepared to accept. And I think that’s why even central banks have always had a role in their portfolios for gold." – Mervyn King, former Governor, the Bank of England