Over the wall



Chinese walls: they sure don't make them like they used to. At one time, a single decree was all it took to begin construction of a wall hundreds of miles long to defend China's Qin empire against the warring Mongols to the north. Yet two millennia on, some financial institutions seem unable to put up even a plasterboard Chinese wall to halt flows of sensitive market information.

Hedge funds are now at the centre of the debate over just how seriously investors are taking the issue of insider

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