Studying the general principles on which the Islamic economy is based, such as the permissibility of selling and forbidding riba, prohibition of immorality and the need to invest, prohibition of fraud, fraud, bribery, and monopoly. The investment deals with its concept and its legal controls, ownership and the foundations of wealth distribution, capital and effort, the difference between economic theory in Islam and other theories: capitalism and socialism, the economic problem and its causes and solutions.