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All case studies

Catastrophic failureTechnology2009

Nortel Networks

Nortel Networks Collapse

Estimated impact: $250B in peak market cap destroyed

F14

Decision Quality Index

Critical — 5 biases detected, 2 toxic combinations

Once valued at $250B and representing one-third of the Toronto Stock Exchange, Nortel filed for bankruptcy after years of accounting fraud and failed strategic pivots. The company restated $3.4B in revenue and was fined for inflating results to trigger executive bonuses.

Decision context

Whether Nortel's strategy of aggressive acquisitions during the telecom bubble, funded by inflated stock, was sustainable once the bubble burst.

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

★ Recency BiasOverconfidence BiasGroupthinkFraming EffectHindsight Bias

3D Decision Knowledge Graph

Nortel Networks — 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
Echo Chamber

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 telecom bubble valuations led to acquisition spree at peak prices
Accounting fraud to maintain the appearance of growth is often a lagging indicator of a fundamentally broken business model
Post-bubble, hindsight bias made the collapse seem obvious, but at the time Nortel was considered a national champion

Source: Ontario Securities Commission proceedings against Nortel executives (2012); Nortel bankruptcy filing (2009) (SEC Filing)

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Lessons learned

Recency bias from telecom bubble valuations led to acquisition spree at peak prices

Accounting fraud to maintain the appearance of growth is often a lagging indicator of a fundamentally broken business model

Post-bubble, hindsight bias made the collapse seem obvious, but at the time Nortel was considered a national champion