According to the theoretical position developed by Karl Marx, what is the catalyst for social change?

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According to Marx's theory of historical materialism, social change is driven by the class struggle between the owners of the means of production (bourgeoisie) and the working class (proletariat). This conflict leads to revolutionary change, as the working class rises up to overthrow the capitalist system and establish a socialist society. Thus, conflict between social groups is the catalyst for social change in Marx's theory.

According to the Theoretical Position Developed by Karl Marx, What