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All case studies

Catastrophic failureFinancial Services2008

Washington Mutual

Washington Mutual Bank Failure

Estimated impact: $307B in assets seized

F14

Decision Quality Index

Critical — 5 biases detected, 2 toxic combinations

WaMu became the largest bank failure in U.S. history with $307B in assets. The thrift aggressively expanded into subprime and option-ARM mortgages, with loan officers incentivized on volume rather than quality. Internal risk reports were systematically ignored by senior leadership.

Decision context

Whether to continue originating high-risk mortgage products as housing prices peaked and delinquency rates began rising in 2006-2007.

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

Overconfidence Bias★ Recency BiasGroupthinkConfirmation BiasOptimism Bias

3D Decision Knowledge Graph

Washington Mutual — 5 biases, 2 toxic combinations

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Decision

Critical

High

Medium

Toxic

Bias Intensity Profile

Severity × confidence across 5 detected biases

Toxic combinations

Recency Spiral
Optimism Trap

Reference class base rates

Across all 146 curated case studies in our library:

90%

base failure rate

10%

base success rate

Lessons learned

Recency bias from years of rising home prices created false confidence in perpetual appreciation
Incentive structures rewarding loan volume over quality systematically degrade underwriting standards
When risk officers are overruled by revenue-generating divisions, the institution has no effective risk management

Source: FDIC OIG Material Loss Review, Report No. MLR-10-007 (2010) (Case Study)

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Lessons learned

Recency bias from years of rising home prices created false confidence in perpetual appreciation

Incentive structures rewarding loan volume over quality systematically degrade underwriting standards

When risk officers are overruled by revenue-generating divisions, the institution has no effective risk management