Shut down banks.

WASHINGTON – Federal Reserve Chairman Ben Bernanke told a panel investigating the financial crisis that regulators must be ready to shutter the largest institutions if they threaten to bring down the financial system. "If the crisis has a single lesson, it is that the too-big-to-fail problem must be solved," Bernanke said Thursday while testifying before the Financial Crisis Inquiry Commission. Bernanke also said it was impossible for the Fed to rescue Lehman Brothers from bankruptcy in 2008 because the Wall Street firm lacked sufficient collateral to secure a loan. Lehman's former chief executive told the panel a day earlier that the firm could have been saved, but regulators refused to provide help.Link