Marxism is a method of socioeconomic analysis that originates in the works of 19th century German philosophers Karl Marx and Friedrich Engels. Marxism analyzes and critiques the development of class society and especially of capitalism as well as the role of class struggles in systemic, economic, social and political change. It frames capitalism through a paradigm of exploitation and analyzes class relations and social conflict using a materialist interpretation of historical development (now known as "historical materialism") – materialist in the sense that the politics and ideas of an epoch are determined by the way in which material production is carried on. From the late 19th century onward, Marxism has developed from Marx's original revolutionary critique of classical political economy and materialist conception of history into a comprehensive world-view. There are now many different branches and schools of thought, with the result that there is now no single definitive Marxist theory. Different Marxian schools place a greater emphasis on certain aspects of classical Marxism while rejecting or modifying other aspects. Some schools of thought have sought to combine Marxian concepts and non-Marxian concepts which has then led to contradictory conclusions. Marxism–Leninism and its offshoots are the most well-known Marxist schools of thought as they were a driving force in international relations during most of the 20th century. Marxism Marxism analyzes the material conditions and the economic activities required to fulfill human material needs to explain social phenomena within any given society. It assumes that the form of economic organization, or mode of production, influences all other social phenomena—including wider social relations, political institutions, legal systems, cultural systems, aesthetics, and ideologies. The economic system and these social relations form a base and superstructure. As forces of production improve, existing forms of organizing production become obsolete and hinder further progress. As Karl Marx observed: "At a certain stage of development, the material productive forces of society come into conflict with the existing relations of production or—this merely expresses the same thing in legal terms—with the property relations within the framework of which they have operated hitherto. From forms of development of the productive forces these relations turn into their fetters. Then begins an era of social revolution". These inefficiencies manifest themselves as social contradictions in society which are, in turn, fought out at the level of the class struggle. Under the capitalist mode of production, this struggle materializes between the minority (the