all policy shall be based on the weight of evidence
for an economic policy is a disaster. There is no "weight of evidence" as every situation that a central bank, finance ministry or stock exchange would be unique.
However, simply by knowing that the country was following a "rational" policy means it would be gamed by all the "players" who could get access. Although it's doubtful that any actual people would get a look - since the automatic traders would dominate the day. Outsmarting a system like that would make taking candy from a baby look like hard work.