How the Glass-Steagall Act Separated Banking Activities

The 37 Pages That Reshaped American Finance for 66 Years

Between 1929 and 1933, nearly 10,000 American banks failed. Depositors lost $1.3 billion—equivalent to roughly $30 billion today. Congressional hearings led by Ferdinand Pecora exposed how major banks had used depositor funds to speculate in securities, underwrite risky stock offerings, and push those investments on unsuspecting customers. Senator Carter Glass of Virginia and Representative Henry Steagall of Alabama responded with the Banking Act of 1933, a 37-page statute that drew an unmistakable line: commercial banks could accept deposits and make loans, or investment banks could underwrite and trade securities, but no institution could do both. That wall stood until 1999.

The Two Sides of the Wall

Glass-Steagall created two distinct financial industries with separate regulatory regimes, business models, and risk profiles.

The logic was clear. Banks holding federally insured deposits should not gamble with that money in securities markets. If an investment bank failed, its investors lost their capital—a market outcome. If a commercial bank failed, taxpayers stood behind the deposit insurance fund. Mixing the two created a moral hazard: banks could take aggressive trading risks knowing depositors were protected by the government.

FDIC: The Companion Reform

Glass-Steagall's Section 8 created the Federal Deposit Insurance Corporation, initially guaranteeing deposits up to $2,500 per account. Representative Steagall championed deposit insurance over Glass's objections—Glass viewed the activity restrictions as the real reform and insurance as a costly distraction. History proved both men partially right. The FDIC restored public confidence in banking, ending the devastating bank runs of the early 1930s. But the activity restrictions Glass fought for would eventually erode.

Six Decades of Erosion

The wall began cracking long before its formal demolition. Starting in the 1980s, regulators and courts gradually expanded what commercial banks could do.

• 1987 — The Federal Reserve allowed bank holding companies to derive up to 5% of revenue from investment banking activities through "Section 20" subsidiaries
• 1989 — The Fed increased the Section 20 revenue limit to 10%
• 1996 — The limit rose to 25%, effectively allowing major commercial banks to operate substantial trading operations
• 1998 — Citicorp merged with Travelers Group (which owned Salomon Smith Barney) to form Citigroup, the largest financial services company in the world. The merger technically violated Glass-Steagall, but regulators granted a temporary waiver, and everyone understood the law would soon change

The Citigroup merger was the final proof that Glass-Steagall was already dead in practice. Formal repeal was a legislative acknowledgment of regulatory reality.

Gramm-Leach-Bliley: The 1999 Repeal

The Financial Services Modernization Act of 1999, known as Gramm-Leach-Bliley after its three Republican sponsors, formally repealed Glass-Steagall's separation of commercial and investment banking. President Clinton signed the bill on November 12, 1999, calling it "a major achievement" that would "enhance the stability of our financial services system."

The law allowed the creation of financial holding companies that could engage in banking, securities, and insurance activities under one corporate umbrella. The largest banks moved quickly to build or acquire investment banking, trading, and insurance operations.

The 2008 Connection Debate

When the financial crisis struck in 2008, a fierce debate erupted over whether Glass-Steagall's repeal bore responsibility. The arguments break down sharply.

The case for blaming the repeal:

• Banks grew "too big to fail" by combining deposit-taking with trading, creating systemic risk
• Deposit-funded institutions took on mortgage-backed securities trading risks they didn't fully understand
• The cultural merger of conservative commercial banking with aggressive trading fostered reckless risk-taking
• Taxpayer-backed institutions earned profits from speculative activities and socialized the losses

The case against blaming the repeal:

• The firms at the center of the crisis—Bear Stearns, Lehman Brothers, AIG—were not commercial banks and would not have been subject to Glass-Steagall
• The toxic mortgage-backed securities were created and traded by investment banks operating under pre-repeal rules
• Canada, which never separated commercial and investment banking, avoided a banking crisis
• Citigroup, the poster child for Glass-Steagall repeal, was bailed out—but its problems stemmed from poor risk management, not the mere combination of activities

The Volcker Rule: Partial Restoration

Section 619 of the Dodd-Frank Act of 2010, known as the Volcker Rule after former Federal Reserve Chairman Paul Volcker, prohibits banking entities from engaging in proprietary trading (trading for the bank's own profit rather than on behalf of clients) and from owning or sponsoring hedge funds and private equity funds. The rule does not rebuild Glass-Steagall's full wall—banks can still underwrite and make markets in securities. But it targets the specific speculative activities that Volcker identified as most dangerous when combined with insured deposits.

Implementation proved complex. The original Volcker Rule ran to nearly 1,000 pages of regulatory text. A 2019 revision simplified compliance for smaller institutions while maintaining restrictions on the largest banks. Whether the Volcker Rule adequately substitutes for Glass-Steagall's bright-line separation remains contested among financial regulators, economists, and legislators who periodically introduce bills to restore the original framework.

Disclaimer: This article is for informational purposes only and does not constitute financial advice. Individual circumstances vary significantly. Consult a qualified financial professional for personalized guidance.