Lands near the great rivers gave unprecedented harvests, food supplies began to appear, and a sharp increase in population took place. Since there was a lot of harvest, there was no need for the whole team to get food. This made it possible to send people to the development of new areas of activity. This is how the division of labor appeared: some were engaged in the extraction of food, others – in craft.
Large harvests led to population growth and the emergence of new activities. People with different social status appeared: rich and poor. This explains the emergence of social differentiation.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.