On September 15, 2008, Lehman Brothers — a 158-year-old investment bank with $639 billion in assets — filed for bankruptcy. It was the largest bankruptcy in US history and the moment the Global Financial Crisis became a full-scale catastrophe. The GFC reshaped banking regulation, monetary policy, and the global economic order in ways still felt today.
The Root Cause: Mortgage-Backed Securities and CDOs
The crisis began in the US housing market. Banks originated mortgages to borrowers who could not afford them (subprime loans), then packaged these mortgages into securities (MBS) and sold them to investors worldwide. Rating agencies gave these toxic bundles AAA ratings.
Collateralised Debt Obligations (CDOs) took this further — slicing and repackaging MBS into tranches of varying risk. The complexity was so extreme that even the banks holding these instruments did not fully understand their exposure. When US house prices began falling in 2006, the entire structure began to unravel.
The Lehman Moment: September 15, 2008
The US government had already rescued Bear Stearns (March 2008) and nationalised Fannie Mae and Freddie Mac (September 7, 2008). When Lehman Brothers sought a bailout, Treasury Secretary Hank Paulson refused — a decision that sent shockwaves through global markets.
Within 24 hours of Lehman's bankruptcy, money market funds "broke the buck" (fell below $1 NAV), interbank lending froze, and credit markets seized. The Dow fell 504 points on September 15 alone. The S&P 500 would ultimately fall 57% from its October 2007 peak to its March 2009 trough.
The Government Response: QE and TARP
The US government responded with the $700 billion Troubled Asset Relief Program (TARP), which purchased toxic assets from banks and injected capital directly into financial institutions. The Federal Reserve cut rates to near zero and launched Quantitative Easing — purchasing $1.75 trillion in mortgage-backed securities and Treasury bonds.
These unprecedented interventions stabilised the financial system but created new distortions: a decade of near-zero interest rates, inflated asset prices, and growing wealth inequality as financial assets soared while wages stagnated.
The Regulatory Legacy: Dodd-Frank and Basel III
The Dodd-Frank Wall Street Reform Act (2010) introduced the Volcker Rule (limiting proprietary trading by banks), created the Consumer Financial Protection Bureau, and established new oversight for systemically important financial institutions.
Basel III imposed higher capital requirements on banks globally, requiring them to hold more high-quality liquid assets. Stress tests became mandatory. The "too big to fail" problem was partially addressed, though critics argue the largest banks emerged from the crisis even larger than before.
✅ Key Takeaways
- Subprime mortgages packaged into CDOs created a hidden systemic risk bomb
- Lehman's bankruptcy on September 15, 2008 triggered the full-scale crisis
- The S&P 500 fell 57% from peak to trough — the worst since the Great Depression
- QE and TARP stabilised markets but created a decade of distorted asset prices
- Dodd-Frank and Basel III reshaped global banking regulation permanently
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