> As is sometimes said in management theory "it was a great measure until it was made a target". And in economics this is called the Lucas critique[1] (any eco

> As is sometimes said in management theory "it was a great measure until it was made a target". And in economics this is called the Lucas critique[1] (any economic policy which targets a particular metric eventually results in the metric being gamed and thus no longer being a useful metric -- even if the public does not do this maliciously). [1]: https://en.wikipedia.org/wiki/Lucas_critique https://en.wikipedia.org/wiki/Lucas_critique