There’s just one problem with this story line: It’s not true. Nor is it hard to prove that. Look at the historical leverage of the big five investment banks — Bear Stearns, Lehman Brothers, Merrill Lynch, Goldman Sachs and Morgan Stanley. The Government Accountability Office did just this in a July 2009 report and noted that three of the five firms had leverage ratios of 28 to 1 or greater at fiscal year-end 1998, which not only is a lot higher than 12 to 1 but also was higher than their leverage ratios at the end of 2006. So if leverage was higher before the rule change than it ever was afterward, how could the 2004 rule change have resulted in previously impermissible leverage?