Abstract World economic system theoretically there are three classifi cations of the global capitalist economy, a socialist economic system and the economic system of Islam. Empirically third of the economic system is the role of fi nancial institutions either banks or non-bank much earlier unknown in Islam systematically. Domination of banking institutions that can be felt has penetrated into the fi eld of business and corporate, political, social, educational and cultural. So unwittingly activities of human life as if controlled by a banking institution. In its operation there is one thing that is often a debate among Muslim scholars that the application of interest in the world banking system. Legality rate system which is still considered ...