From the above, we reach these conclusions:
First: The science of economics and the economic doctrine differ in their basic function: The function of science is the discovery (and analysis) of the economic life and its phenomena as they exist in the world of reality, while the function of the doctrine is to find a way to regulate the economic life as it ought to be, according to its general concepts of equity. Science, therefore, tries to embody reality, while doctrine tries to embody equity.
Second: The science of economics deals with both production and distribution, while the economic doctrine deals with both production and distribution, and there is no basis for distinguishing between them (between the science and the doctrine) on the basis of the subject-matter by making production the concern of science while assigning distribution as the concern of the doctrine, because science and doctrine differ only in the task and method of research, not in the subject-matter.
Third: The laws of the science of economics, regarding production, express fixed facts applicable to various societies regardless of the economic doctrine they follow. As regarding the laws of the science of economics in distribution, these are conditioned to a certain doctrinal frame; that is, the economist preconditions the existence of a society which practices a certain kind of doctrine like capitalism and of economic freedom, then he tries to discover the laws and economic life of such a society.