The unity of humanity is not only in its origin but also in its ultimate aims. Earning is man's private possession. The individual is responsible for the prosperity of the state and the state is responsible for the security of the individual. The Islamic economic system is not based on arithmetical calculations alone but also on morals and principles. The real owner of things is God alone.
Man is simply a trustee.
The ruler is only an acting executive chosen by the people to serve them according to God's law. The State is to administer justice and provide security for all citizens. Rulers and administrators must be chosen from the best qualified citizens. If an administration betrays the trust of God and the people, it has to be replaced. Non Muslims can administer their personal life of marriage, divorce, foods and inheritance according to the Islamic law or to their own religious teachings.