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Marx was not just a theorist but also a revolutionary; and stated in his "Thesis on Feuerbach": "The philosophers have only interpreted the world, in various ways; the point, however, is to change it."
The Bolshevik Revolution in Russia (1917) and the Communist Revolution in China (1949) affected the lives of a significant percentage of the world population. Almost one-fourth of the world's population lived under governments that claimed to be Marxist in the second half of the 20th century.
Adam Smith had specified four stages of successive social development, i.e., the age of hunters, the age of herders or shepherds, the age of farmers and the commercial age
Capitalism, according to the Marxist definition, is a system in which the producers are the employees and do not have the means to own the equipment and material needed to produce the commodities.
Marx wrote in the "Communist Manifesto" that "The executive of the modern state is but a committee for managing the common affairs of the bourgeoisie."
Jean Baptiste Say (1767-1832), a French economist, was one of Adam Smith's most faithful disciples, who was a great believer in 'laissez faire' and the 'self-correcting' mechanism of a market economy.
In his work, "The Essence of Christianity," Feuerbach argued that God is really a creation of man and that the qualities people attribute to God are really qualities of humanity.
Marx and Keynes