► Stay one step ahead with FT.com - subscribe and save 50%:<br />http://bit.ly/28WUpaa<br /><br />► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />John Authers analyses another tough day on Wall Street as world markets battle to understand the implications of the UK's Brexit vote. <br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
