Turmoil in the U.S. credit markets : examining the regulation of investment banks by the U.S. Securities and Exchange Commission : hearing before the Subcommittee on Securities and Insurance and Investment of the Committee on Banking, Housing, and Urban Affairs, United States Senate, One Hundred Tenth Congress, second session on steps taken by the agency then and now to encourage the investment banks that it regulates to better manage their risks and how the SEC can be strengthened to meet its mission as the advocate for investors while overseeing securities markets and financial stability of Wall Street firms, Wednesday, May 7, 2008