If certainty is the friend of the investor, uncertainty is definitely
the opposite. The surprising Brexit vote caused investors to quickly
move towards traditional safe havens. Currency markets experienced very
high volatility as the British pound plunged and the Dollar and Yen
rose. Perhaps the biggest concern of investors may be what the Brexit
vote may foretell about the influence of populist political movements on
other democratic governments.
https://www.nytimes.com/2016/06/25/business/international/brexit-financial-economic-impact-leave.html
https://www.nytimes.com/2016/06/25/business/international/brexit-financial-economic-impact-leave.html