In sport, coaches help their valuable charges by analysing their every move. Michael Ervolini, chief executive of Cabot Research, tells John Authers that fund managers can also be coached to improve performance, particularly on when to sell.<br /><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
