► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />Apple has just returned the most profitable quarter of any public company in history. Lex's Oliver Ralph and Robert Armstrong discuss why it is difficult to value the iPhone maker and how innovative it needs to be.<br /><br />► FT Business: http://bit.ly/1KUK08s<br /><br />► Lex: http://bit.ly/1I14JZF<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
