Every metric eventually becomes a proxy for the thing it was supposed to measure.
Not through deception. Through optimization.
In financial systems, account activity is tracked to detect dormancy. The problem: anything that touches the ledger counts as movement. Automated fees. Interest credits. System-generated charges. The account stays active on paper. The client hasn’t touched it in three years.
Nobody designed this outcome. They designed a rule. The rule got optimized. The metric drifted.
This happens everywhere. Engagement replaces attention. Clicks replace interest. Compliance reports replace risk management. The measure runs on, producing numbers, while the underlying reality it was supposed to describe has quietly stopped.
The dangerous moment isn’t when someone games the metric. It’s when no one remembers it was a proxy in the first place.
The measure is not the thing. It started as a pointer to the thing. When you forget the difference, you manage the pointer.