U.S. market won't hit bottom until next year and values will fall 40 percent from 2007 peaks, survey finds.
Limited liability for shareholders doesn't sufficiently limit banks' risk taking, says FDIC researcher.
Congress must also limit banks' size and activities, researcher to testify on Thursday.
Janet Tavakoli argues there is no guarantee hedges will pay off "when the chips are down."
Asset price inflation has exceeded GDP by 1.3 percent annually since 1960, thanks to low interest rates.