On September 16, 1992 — "Black Wednesday" — George Soros's Quantum Fund shorted £10 billion of British pounds, forcing the UK to withdraw from the European Exchange Rate Mechanism (ERM). Soros made $1 billion in a single day. The Bank of England spent £27 billion defending the pound before capitulating. It remains the most famous currency trade in history and a masterclass in identifying unsustainable policy.
The Setup: The ERM and Britain's Impossible Position
The European Exchange Rate Mechanism required member currencies to trade within fixed bands against the German mark. Britain had joined the ERM in October 1990 at a rate of 2.95 DM per pound — widely considered too high.
By 1992, Britain was in recession, with unemployment at 10% and rising. The appropriate policy was to cut interest rates. But cutting rates would weaken the pound below its ERM floor, requiring Britain to either raise rates (deepening the recession) or devalue (leaving the ERM). Soros identified this as an unsustainable position.
The Trade: Shorting the Impossible Peg
Soros's Quantum Fund borrowed pounds and sold them for marks — building a short position of £10 billion. Other hedge funds, recognising the same opportunity, joined the trade. By September 16, the selling pressure was overwhelming.
The Bank of England raised interest rates from 10% to 12% in the morning, then announced a further rise to 15% in the afternoon — desperate measures to attract capital and defend the pound. The market ignored the rate hikes. The selling continued.
The Capitulation: Britain Leaves the ERM
At 7:30 PM on September 16, Chancellor Norman Lamont announced that Britain was suspending its ERM membership and cutting interest rates back to 10%. The pound immediately fell 15% against the mark.
The Bank of England had spent £27 billion in reserves defending the pound — all lost. Soros's profit: approximately $1 billion in a single day. The trade became legendary, establishing Soros as the greatest currency trader of his generation and demonstrating that no central bank can indefinitely defend an unsustainable peg against determined market forces.
The Unexpected Outcome: Britain's Economic Recovery
Black Wednesday was presented as a humiliation for Britain — and politically, it was. The Conservative government never recovered its reputation for economic competence. But economically, leaving the ERM was the best thing that happened to Britain in a decade.
With the pound devalued and interest rates free to fall, the British economy recovered strongly. GDP growth averaged 3% per year for the rest of the decade. The lesson: sometimes the market forcing a policy correction is better for the economy than the policy itself.
✅ Key Takeaways
- Soros shorted £10B of pounds on September 16, 1992, making $1B in a single day
- Britain's ERM membership required defending an overvalued pound during a recession
- The Bank of England spent £27B in reserves before capitulating at 7:30 PM
- The pound fell 15% immediately after Britain left the ERM
- Britain's economy recovered strongly after the devaluation — the market was right
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