<human>:  Where does the theory of liberation come from?
<bot>: The theory of liberation comes from the work of Karl Marx. Karl Marx was a German philosopher and economist who developed a set of ideas about society and economics that are still studied today. He argued that all of history is shaped by the struggle between two classes: the bourgeoisie and the proletariat. The bourgeoisie are the owners of the means of production, and the proletariat are the working class. The bourgeoisie exploit the proletariat by paying them less than they are worth, and by keeping them in poverty.