A few months ago Ian Sideris, a partner at Simmons & Simmons law firm, was completing a contract for a collateralised debt obligation when he asked a delicate question: who was the investor buying this CDO, a complex instrument that allows investors to buy pools of debt? The answer took him aback.

Rather than a hedge fund or bank, as Mr Simkins had expected, the client was an Australian charity. "We need to realise that the universe of investors for this type of product has widened in the last year," he says. "But then you also have to wonder about the capacity of some of these new investors to understand the economics [of what they are buying]."