Adam Smith believed that the division of labor leads to greater productivity and wealth. As the market size increases, labor can be more specialized. People act in rational self-interest, which contributes to the greater social good through market exchanges. Marx focused on social relations of production and argued that capitalism leads to the exploitation of workers as they do not receive the full value of their labor. He believed history moves towards a violent proletariat revolution against capitalists and the establishment of a communist system without private property.