The Psychology of Treasury
Volume 5 · Companion tool

Model Blindness

When maths feels safer than judgement

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TOOL IRRBB Exercise Tool  ·  Illustrative — not a validated regulatory model.

Companion tool

IRRBB Exercise Tool

Runs in your tools workspace with your own numbers — every figure computed by the server engine.

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A model is a set of assumptions that has been given a number — and mistaking the map for the territory is a governance failure, not a maths one. Case study: JPMorgan London Whale (2012) (anchor pending confirmation).

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