Barclays' shares dropped on news that New York's top securities regulator had sued the UK bank for allegedly favouring high-speed traders using its 'dark pool' trading venue while misleading institutional investors. Lex's Alan Livsey and Oliver Ralph discuss the financial and reputation risk to Barclays.<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br />Subscribe to the Financial Times on YouTube; http://goo.gl/vUQx5k<br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
