The banking legislation of the 1930s took very little time to pass, was unusually comprehensive, and unusually responsive to public opinion. Ironically, the primary motivations for the main bank regulatory reforms in the 1930s (Regulation Q, the separation of investment banking from commercial banking, and the creation of federal deposit insurance) were to preserve and enhance two of the most disastrous policies that contributed to the severity and depth of the Great Depression — unit banking and the real bills doctrine. Other regulatory changes, affecting the allocation of power between the Federal Reserve System (Fed) and the Treasury, were intended to reduce the independence of the Fed, while giving the opposite impression. Banking reforms in the 1930s had significant negative consequences for the future of US banking, and took a long time to disappear. The overarching lesson is that the aftermath of crises are moments of high risk in public policy.
Calomiris, Charles. "The Political Lessons of Depression-Era Banking Reform." Oxford Review of Economic Policy 26, no. 3 (2010): 540-560.
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