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Goodhart's law is an adage often stated as:
" When a measure becomes a target, it ceases to be a good measure "
or
" Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes. "
Named after British economist Charles Goodhart, credited with expressing the core idea of the adage in a 1975 article on monetary policy in the United Kingdom:
It was used to criticize the British Thatcher government for trying to conduct monetary policy on the basis of targets for broad and narrow money.
Anthropologist Marilyn Strathern DBE expressed Goodhart's Law as "When a measure becomes a target, it ceases to be a good measure,"
