Warren Buffett just shared his best investment advice, and said the 'elite' have wasted $100 billion ignoring it

"Becoming Warren Buffett"/HBO Warren Buffett's Berkshire Hathaway is out with its annual letter to shareholders. The letter covers a bunch of topics, touching on everything from stock buybacks to his favorite book of 2016, and also provides some investment advice. "Over the years, I’ve often been asked for investment advice, and in the process of answering I’ve learned a good deal about human behavior," Buffett said in the letter. "My regular recommendation has been a low-cost S&P 500 index ...