INSIGHT-Passive funds an active threat for Europe's fund managers
August 31, 2014 at 08:43 AM EDT
LONDON, Aug 31 (Reuters) - Warren Buffett built a fortune of nearly $60 billion from astute stock picking, but when the 83-year-old dies, the vast majority of the money he leaves his wife will be parked in a fund that simply moves in step with an index.