Remembering Martin Zweig: Forecasted 1987 Crash

Feb. 20 (Bloomberg) -- Bloomberg's Tom Keene and Gluskin Sheff chief economist and strategist David Rosenberg remember Martin Zweig, who predicted the 1987 stock market crash and whose newsletters influenced U.S. investors for a quarter century, who has died at the age of 70. They speak on Bloomberg Television's "Bloomberg Surveillance."