Apr 27: Long View Part 1 - The wisdom of crowds

April 27 2009: Are markets efficient? How does the wisdom of crowds affect the markets? In a special series of video interviews, John Authers seeks to find out if the worst is behind us, and if the financial world will ever be the same again. In this section, Michael Mauboussin, chief investment strategist at Legg Mason Capital Management explains what a study of psychology teaches us about market trends. Produced by Josh Noble Filmed by Gregory Bobillot