Goodhart's law

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What Wikipedia says

Goodhart's law is an adage that has been stated as, "When a measure becomes a target, it ceases to be a good measure". It is named after British economist Charles Goodhart, who is credited with expressing the core idea of the adage in a 1975 article on monetary policy in the United Kingdom:

Excerpt from the Wikipedia article “Goodhart's law”, under the CC BY-SA 4.0 license. Read the article on Wikipedia