Whatever the cause it's a gloomy picture. You interpret it how you want, just as the rest will. Bear in mind that lots of stuff was fairly volatile immediately before Brexit due to the uncertainty of the way the vote would go. So it's fair to say some indices could have been on a high immediately before (I mean immediately, like one day) and some on a low. Hard to tell what to take as a reasonable starting point really, so just looking at a shape is probably best
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