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"When a measure becomes a target, it ceases to be a good measure" (Goodhart’s Law, alternatively: "Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes")

Inevitably #xkcd asks whether there is a metric to identify vulnerable metrics 🙂

#openriskmanual

https://www.openriskmanual.org/wiki/Goodhart%E2%80%99s_Law

https://xkcd.com/2899/