Final answer:
Karl Marx believed that struggles between groups are necessary for the development of class consciousness, which is an awareness of one's rank in society. These class struggles have historically driven social change and are seen by Marx as steps toward a more egalitarian society.
Step-by-step explanation:
Karl Marx believed that struggles between groups are necessary for the development of Class consciousness. According to Marx, class conflict arises from the emergence of property, and throughout history, class struggles have been the driving force behind social change. Marx saw these conflicts as steps toward a more egalitarian society, where wealth and authority would be more evenly dispersed among the population. This idea of class struggle and the eventual development of class consciousness formed the basis of Marx's philosophy and his vision of a communist society.