Warren Buffett lays out the 'gory details' of the 4 times Berkshire's stock suffered huge drops -- and his advice for surviving a market downturn

Reuters/Shannon Stapleton Warren Buffett laid out the four times Berkshire Hathaway shares got crushed. He says these big drops show why investors should never use borrowed money. Warren Buffett delivered his annual letter to Berkshire Hathaway shareholders on Saturday, and in it helaid out the "gory details" of the four times Berkshire shares got crushed. "For the last 53 years, the company has built value by reinvesting its earnings and letting compound interest work its magic," Buffett wrote....