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Karl Marx was a 19th century philosopher, author and economist famous for his ideas about capitalism. He is the inventor of marxism, and believed economy should be capitalist, where simply you work for what you have.
Karl Marx is the founder of the idea of communism and he authored the Communist Manifesto. He was a German philosopher, economist, sociologist and socialist revolutionary among other things. He believed that the value of economic goods could be measured objectively by the average number of hours of labor required for production.