What does Godhart’s law mean?

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It goes “When a measure becomes a target, it ceases to be a good measure.” How does that work in practice?

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For example, suppose I run a company whose job is to clean up park. I get the idea of rewarding workers per square meter they cleaned. This can have the unintended consequence of workers rushing through the park with their brooms, maximizing the area while doing poor job.

Basically, if you set a metric that doesn’t absolutely perfectly capture your goal, you run a risk of people trying to game the system and maximize that metric alone while neglecting other important aspects of their jobs.

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