Before revision:  Such processes have been described by a law attributed to Charles Goodhartor Donald T. Campbell, most pithily phrased as: 'When a measure becomes a target it ceases to be a good measure.' While the original mentions of this lawaddress policy determination or education respectively, we propose it applies to any competitive societal system : Any proxy measure in a competitive societal system becomes a target for the competing individuals (or groups) .
After revision:  To paraphrase what has become known as Goodhart's or Campbell's law : Any proxy measure in a competitive societal system becomes a target for the competing individuals (or groups) .