Barings Bank
Barings Bank Collapse
Estimated impact: $1.3B
Nick Leeson, a derivatives trader in Barings' Singapore office, accumulated $1.3 billion in hidden losses through unauthorized speculative trades on Nikkei futures. The 233-year-old bank collapsed when the losses were discovered, as management had granted Leeson unsupervised authority over both trading and settlement.
Decision context
Whether to maintain Leeson's dual role overseeing both trading execution and back-office settlement without independent oversight.
Decision anatomy
Red = risk factor present · Green = protective factor present
The analysis below was produced from the pre-decision document only. No hindsight. This is what the platform would have surfaced if it had been running at the time.
“Barings' internal audit report on the Singapore futures operation identified that trader Nick Leeson had unsupervised control over both trading and back-office settlement functions — a fundamental violation of segregation-of-duties control. The report flagged the error account (88888) where losses were accumulating but was not escalated with urgency. Leeson's reported profits ($30M in 1994) were inconsistent with the documented arbitrage strategy he was authorized to execute. London management continued to wire margin payments to Singapore on Leeson's request.”
Source: Barings internal audit report; Bank of England 'Board of Banking Supervision' Report, Ch. 4
Red flags detectable at decision time
- Single trader controlling both trading and settlement with no segregation of duties
- Account 88888 ("five-eights") used to hide losses — visible to anyone checking reconciliation reports
- Reported P&L of $30M from "arbitrage" was implausibly high for the authorized strategy
- Margin payments from London to Singapore grew from £30M to £500M in 12 months
- SIMEX inquiries about unusually large Nikkei futures positions were routed through Leeson himself
Cognitive biases the platform would have flagged
Hypothetical analysis
DI would flag Barings as the canonical gambler's-fallacy + authority-bias combination. Leeson's escalating doubling-down after losses is textbook gambler's fallacy ('the next trade will reverse my losses'). London management's authority bias toward Leeson's reported profits caused them to keep funding the error account even as margin calls grew exponentially. Segregation-of-duties is a bright-line control that no bias-adjusted review of Barings' operations would have left unaddressed.
Biases present in the decision
★ Primary driver · Severity estimated from bias type and decision outcome
Toxic combinations
Reference class base rates
Across all 143 curated case studies in our library:
Lessons learned
- Separation of duties between trading and settlement is a non-negotiable control; combining them invites fraud.
- Authority bias led management to trust a profitable trader without questioning the source of returns.
- Remote offices with insufficient oversight can become vectors for catastrophic risk accumulation.
Source: Bank of England Board of Banking Supervision Report on Barings (1995) (Case Study)
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Workflows that fire on decisions like Barings Bank’s
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