"Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes.", or: "When a measure becomes a target, it ceases to be a good measure"
Economic Point: Goodhart's Law
There ought to be a law! Campbell versus Goodhart, Significance, 2018-12
Gary N. Smith and Jeffrey Funk: Goodhart’s Law and Scientific Innovation in Academia, Mind Matters, 2023-01-30