The Glass-Steagall Act (1933): The Wall Between Banking and Speculation

A Banking Catastrophe Without Precedent

When Franklin D. Roosevelt took the oath of office on March 4, 1933, banking activity in the United States had effectively ceased. Nearly 9,000 banks had failed since the onset of the Depression in 1930, vaporizing approximately $7 billion in depositor savings. In the final, panicked weeks of the Hoover administration, governors across the country had declared bank holidays — suspending operations entirely — as withdrawal lines stretched around city blocks. Roosevelt's first act as president was to declare a national bank holiday on March 6, shutting every bank in the nation for four days while Treasury officials sorted the solvent from the dead.

How had it come to this? Investigators pointed to a structural flaw that had metastasized during the 1920s: commercial banks — institutions entrusted with the savings of schoolteachers, shopkeepers, and factory workers — had plunged headlong into the business of underwriting, promoting, and trading securities. When the stock market crashed in October 1929, losses on those securities fed directly back into the banking system, destroying institutions that might otherwise have weathered an ordinary downturn.

Ferdinand Pecora Takes the Stand

Political groundwork for reform was laid by one of the most dramatic congressional investigations in American history. In January 1933, the Senate Banking and Currency Committee appointed Ferdinand Pecora — a Sicilian-born assistant district attorney from New York — as its chief counsel. Pecora proved to be a relentless interrogator who understood that public outrage, not legal briefs, would drive legislation.

Over the following months, he hauled the titans of American finance before the committee and extracted testimony that shocked the nation. Charles Mitchell, chairman of National City Bank — the forerunner of Citigroup — was forced to admit that his bank had repackaged deteriorating Latin American loans as securities, then aggressively marketed them to retail investors, including the bank's own depositors. When those securities became worthless, customers bore the losses while the institution collected its underwriting fees. Mitchell also revealed that he had sold bank stock to family members at an artificial loss to dodge income taxes, a scheme that led to his indictment.

Partners at J.P. Morgan and Company, meanwhile, were shown to have maintained a "preferred list" of influential politicians and business leaders who received shares in hot initial public offerings at below-market prices — financial patronage that blurred every conceivable line between banking and political influence. Former president Calvin Coolidge was on the list, along with a sitting Supreme Court justice and numerous members of Congress.

Americans who had lost their life savings could now see exactly how the system had been rigged. As Pecora himself later wrote, "The testimony showed beyond question that the public had been the victim of economic forces which it had not been able to understand and against which it had been helpless." Reform became politically irresistible.

Architecture of the Law

Senator Carter Glass of Virginia — a former Treasury Secretary who had helped create the Federal Reserve System in 1913 — and Representative Henry Bascom Steagall of Alabama, chairman of the House Banking Committee, sponsored the legislation. Though the full Banking Act of 1933 contained many provisions, the sections that came to be known collectively as "Glass-Steagall" drove four transformative reforms.

Sections 16 and 21 erected a wall between commercial banking and investment banking. Deposit-taking institutions were prohibited from underwriting or dealing in securities other than government bonds; securities firms, conversely, could not accept deposits. Banks had one year to choose which side of the wall they would inhabit. Consequences were immediate: J.P. Morgan and Company chose to remain a commercial bank, and several of its partners departed to found Morgan Stanley as a separate investment house. First Boston Corporation was spun out of the First National Bank of Boston. Across Wall Street, the landscape was reorganized overnight.

Section 20 closed a loophole that banks had exploited during the twenties — conducting securities business through nominally separate affiliates — by prohibiting Federal Reserve member banks from affiliating with firms principally engaged in securities activities.

Deposit insurance, championed by Steagall over the initial objections of both Roosevelt and Glass, may have been the most consequential provision of all. The newly created Federal Deposit Insurance Corporation guaranteed individual bank deposits up to $2,500, a figure that would be raised repeatedly over the decades. By assuring small depositors that their money was safe regardless of a bank's fortunes, the FDIC attacked the bank-run problem at its root. Steagall argued the point bluntly on the House floor: "This bill will do more for the little depositor than anything that has been proposed in any legislature."

Regulation Q, the act's fourth pillar, prohibited the payment of interest on demand deposits and capped rates on time deposits, preventing banks from competing recklessly for funds by offering unsustainably high rates.

Four Decades of Stability

What followed was a stretch of calm unlike anything in American banking history. Between 1941 and 1979, bank failures averaged fewer than six per year — a stunning contrast with the thousands of collapses that had defined the early 1930s. Commercial banks focused on their core work of accepting deposits and extending loans. Investment banks operated as partnerships where the partners' own capital sat on the line, creating powerful incentives for caution.

Two distinct cultures emerged. Commercial banking prized conservatism, relationships, and steady returns. Investment banking cultivated an entrepreneurial, risk-tolerant ethos — but one constrained by the discipline of personal liability. Neither side could raid the other's territory, and the system, if unglamorous, functioned.

Stability came at a cost, critics argued. Separation reduced competition, raised costs for some consumers, and prevented American banks from competing with foreign institutions that faced no such restrictions. By the 1970s, as inflation eroded the value of regulated deposit rates and financial innovation spawned instruments that blurred traditional categories, pressure to dismantle the Glass-Steagall barriers began building in earnest.

A Twenty-Year Erosion

Dismantling did not happen in a single stroke. It was a slow-motion process driven by industry lobbying, regulatory reinterpretation, and a shifting intellectual climate that increasingly viewed Depression-era restrictions as anachronistic.

In 1987, the Federal Reserve Board under Chairman Alan Greenspan began approving applications from bank holding companies to engage in limited securities underwriting through so-called Section 20 subsidiaries — named, with no small irony, after the very provision of Glass-Steagall they were designed to circumvent. Revenue from securities activities was initially capped at 5 percent of a subsidiary's total revenue; that cap rose to 10 percent in 1989 and 25 percent in 1996, each increase widening the breach.

Then came the deal that rendered the law a dead letter before it was formally repealed. In April 1998, Citicorp announced its merger with Travelers Group — an insurance and securities conglomerate that owned investment bank Salomon Smith Barney — in a $70 billion transaction orchestrated by Citicorp chairman John Reed and Travelers chief Sanford Weill. The deal was technically illegal under Glass-Steagall. Both men proceeded with confidence that the law would be changed to accommodate them. Weill, according to multiple accounts, kept a wooden plaque in his office that read: "The Shatterer of Glass-Steagall."

Repeal

On November 12, 1999, President Bill Clinton signed the Gramm-Leach-Bliley Act, formally repealing the Glass-Steagall provisions separating commercial banking, investment banking, and insurance. Named for Senator Phil Gramm of Texas, Representative Jim Leach of Iowa, and Representative Thomas Bliley of Virginia, the legislation passed overwhelmingly — 90 to 8 in the Senate, 362 to 57 in the House — reflecting bipartisan consensus that Depression-era restrictions had outlived their purpose.

At the signing ceremony, Clinton declared the law "no longer appropriate to the economy in which we live." Sanford Weill stood nearby, beaming. Within a decade, the largest American financial institutions had combined commercial banking, investment banking, insurance, and proprietary trading under single corporate umbrellas, with balance sheets measured in trillions of dollars.

Whether repeal contributed to the 2008 financial crisis remains one of the most contested questions in modern financial history. Former FDIC chairman Sheila Bair and former Federal Reserve chairman Paul Volcker argued that removing structural barriers enabled the growth of institutions that were "too big to fail" and created conflicts of interest that corroded lending standards. Banks that both originated mortgages and packaged them into securities had weakened incentives to care whether borrowers could actually repay, and the resulting systemic correlation breakdown during the crisis revealed how deeply interconnected these giants had become.

Defenders of repeal counter that the firms at the epicenter of the 2008 crisis — Bear Stearns, Lehman Brothers, AIG — were not commercial banks and would not have been constrained by Glass-Steagall in any case. The crisis, in this view, stemmed from failures of risk management, inadequate capital requirements, and regulatory blind spots rather than from the mixing of banking functions.

A Question That Will Not Die

Glass-Steagall endures as a touchstone in debates about financial regulation. In the years following the 2008 crisis, proposals to reinstate some form of banking separation drew support across the political spectrum: Senator Elizabeth Warren and Senator John McCain co-sponsored the 21st Century Glass-Steagall Act in 2013, though it never reached a vote. The Volcker Rule, included in the Dodd-Frank Act of 2010, represented a partial return to Glass-Steagall principles by restricting proprietary trading at institutions holding federally insured deposits.

Beneath the policy arguments lies a deeper philosophical question about how best to protect the deposit-taking system — through rules governing behavior, or through structural barriers that prevent certain combinations of activities altogether. This question is closely related to modern portfolio diversification theory's insight that structural separation of risks matters more than behavioral intentions. From 1933 to 1999, the American banking system operated under one answer to that question; since 1999, it has operated under another. The sixty-six years of Glass-Steagall produced fewer than 250 total bank failures. The two decades since its repeal produced a crisis that nearly brought down the global financial system. Correlation is not causation — but it is, at minimum, an invitation to keep asking the question.