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Which cognitive biases caused Continental Illinois National Bank's collapse?

5 bias patterns are documented in this case, led by Cognitive Misering. The full set: Anchoring Bias, Cognitive Misering, Authority Bias, Confirmation Bias, Overconfidence Bias. Each is mapped to Decision Intel's 22-bias R²F taxonomy with stable IDs and academic citations.

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Decision Intel runs a 12-node Recognition-Rigor Framework (R²F) pipeline on strategic memos, detecting cognitive biases from a 22-bias canonical taxonomy and producing a Decision Quality Index (DQI) score. The audit produces a hashed, tamper-evident Decision Provenance Record (DPR) suitable for audit-committee review.

All case studies

Catastrophic failureFinancial Services1984

Continental Illinois National Bank

Continental Illinois Bank Bailout

Estimated impact: $4.5B FDIC bailout

F14

Decision Quality Index (simulated)

Critical · 5 biases detected, 2 toxic combinations

Continental Illinois, the seventh-largest U.S. bank, collapsed after a run on wholesale deposits. The bank had purchased $1B in loan participations from Penn Square Bank without adequate due diligence, anchoring to Penn Square's reported quality metrics.

Decision context

Whether to continue purchasing energy loan participations from Penn Square Bank based on reported loan quality rather than independent underwriting review.

Decision anatomy

Monetary stakes

Very high

Dissent suppressed

Yes

Time pressure

None

Unanimous consensus

Decision participants

Dissent encouraged

External advisors

Iterative process

Red = risk factor present · Green = protective factor present

Deep hindsight-stripped analysis coming soon. This case is part of our ongoing backfill to reconstruct what the platform would have flagged at decision time. The summary and bias profile below are drawn from primary sources.

Biases present in the decision

Anchoring Bias

high

★Cognitive Misering

critical

Authority Bias

high

Confirmation Bias

high

Overconfidence Bias

high

★ Primary driver · Severity estimated from bias type and decision outcome

3D Decision Knowledge Graph

Continental Illinois National Bank · 5 biases, 2 toxic combinations

Drag to rotate · Scroll to zoom · Click to explore

Decision

Critical

High

Medium

Toxic

Bias Intensity Profile

Severity × confidence across 5 detected biases

Toxic combinations

!Yes Committee

Authority bias meets groupthink: the group converges on whatever leadership signals it wants.

!Blind Sprint

Overconfidence combined with planning fallacy creates unstoppable momentum toward failure.

Reference class base rates

Across all 143 curated case studies in our library:

89%

base failure rate

-0%

partial / mixed

11%

base success rate

■ Failure■ Partial■ Success

Lessons learned

Cognitive misering in loan participation reviews — accepting counterparty representations without independent analysis — creates hidden concentration risk
Wholesale funding dependence makes banks vulnerable to confidence-driven runs
The phrase "too big to fail" entered the regulatory lexicon from this case, revealing systemic risk blind spots

Source: FDIC History of the Eighties, Vol. 1, Ch. 7: Continental Illinois (1997) (Case Study)

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We caught these patterns in Continental Illinois National Bank's own record — before the outcome.

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Lessons learned

Cognitive misering in loan participation reviews — accepting counterparty representations without independent analysis — creates hidden concentration risk

Wholesale funding dependence makes banks vulnerable to confidence-driven runs

The phrase "too big to fail" entered the regulatory lexicon from this case, revealing systemic risk blind spots