&gt; The number of assets registering large moves—four or more standard deviations away from their normal trading range—has been increasing. Such moves would normally be expected to happen once every 62 years.<p>This is very troubling. It means traditional models are not working to capture the market correctly at the moment. It was a leading indicator for the 2007 financial crisis - 3 sigma events happening with increasing frequency that were ignored because there were profits to be made from poor risk management.