i belive that if a planet has mostly industrial items it should have high pollution and therby hurt its PQ Slowly. i think PQ could be improved if its well tended too so over years planet Quality increases. anyways, if a planet is all influencial it will have economical problems and be weak in producing Weapons. A all out economy planet would have the issue that tis weak in weapons production and can easily be taken over by Comercial giant civs. fill in any gaps....
