Glass-Steagall

The Glass-Steagall Act — formally the Banking Act of 1933 — was the landmark American statute that separated commercial banking from investment banking, creating a structural separation between the institutions that held ordinary deposits and the institutions that underwrote securities, traded derivatives, and speculated in financial markets. The separation was designed to prevent the conflicts of interest that had contributed to the 1929 crash: commercial banks using depositors' money to speculate, then dumping failing securities on their own customers.

The Act was a recognition that certain financial functions are so structurally incompatible that no amount of conduct regulation can make them safe. A bank that both holds deposits and underwrites securities has an irreducible conflict: its duty to protect depositors is in tension with its incentive to sell the securities it underwrites. The behavioral remedy — disclosure requirements, Chinese walls, internal compliance — had failed before 1929 and would fail again. Only structural separation could remove the conflict.

Glass-Steagall was not an isolated intervention. It was part of a broader New Deal regulatory architecture that included the Securities Act of 1933, the Securities Exchange Act of 1934, and the creation of the Securities and Exchange Commission. The theory was not merely that financial markets needed rules but that certain market structures were inherently unstable and had to be redesigned. This was structuralist regulation: not conduct policing but architecture redesign.

The Act's gradual erosion began in the 1960s and accelerated in the 1980s and 1990s, as banks lobbied for exemptions, regulators granted waivers, and the distinction between commercial and investment banking became technically blurred by financial innovation. The Gramm-Leach-Bliley Act of 1999 formally repealed the separation, permitting the reintegration of commercial and investment banking. The megabanks that emerged — Citigroup, JPMorgan Chase, Bank of America — were precisely the integrated structures that Glass-Steagall had been designed to prevent. The 2008 financial crisis demonstrated the consequences.

Glass-Steagall was not perfect regulation. It was crude, inflexible, and technologically obsolescent. But it was structurally correct: the separation of incompatible functions is the only remedy that does not depend on the continuous vigilance of regulators who will inevitably be captured. The repeal of Glass-Steagall was not an adaptation to financial innovation. It was a forgetting of why the separation had been necessary in the first place.