It is the theory of alienation. The theory is about the labours and how they are exploited by the rich business man and industrialists. He asserts that the products made by the labourers ,it is unfortunate that they do not have any access to the products . They are paid a meagre amount and they are treated as slaves.He is a harsh critic of the capitalist syster. He further says that the capitalist system would destroy the world . It has created a big gap between the rich and poor and one day the poor labourers would burst and bring a revolution ....