Which position, appointed by the president, plays a significant role in managing and supervising the national economy?

Answer- Secretary of the Treasury

The Secretary of the Treasury is one of the officers appointed by the President of the United States. The person appointed to this position plays a very significant role in the management and in the supervision of the national economy

monarchy doesn’t have to have the hereditary element. there have been elective monarchies in the past where you choose your king-for-life and when he dies elect someone else for the job.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.