No one does. The process of decision-making in this economy would not be based upon the opinions of politicians, corporate interests, or national interests.  But rather all decisions would be arrived at based upon current knowledge, the introduction of newer technologies and earth's carrying capacity. A systems-approach to solving problems makes use of interdisciplinary teams, aided by computer technology which could provide feedback systems from the environment, industrial complexes and any physical complex to arrive at the best possible decisions and solutions at that time.