Why is there social inequality in society? What are the positive and negative sides of this phenomenon?

The formation of social inequality in society is a natural process that began in the days of the primitive system. Paradoxically, it was social inequality that stimulated people to develop industrial relations. The formation of a society of general economic equality is not possible due to the fact that we are born initially not in equal conditions of family prosperity. A positive feature is the progress of social, economic and political ideas aimed at striving for equality. The negative is the economic exploitation of the ruling class.