► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />Vinny Catalano, president and global investment strategist of investment research firm Blue Marble, tells John Authers that while there are metrics one can follow to identify a bubble, all measures are largely tied to subjective valuation models.<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
