Answer:
The answer is the labor specialized or specialized workers.
Explanation:
Before that, every member of early civilizations were generalists, mostly in agricultural production, to earn a living. Making pottery and textiles was for personal usage or for fun. However, the development of pottery and textiles usage started professionals in the society. The progress enabled innovations, leaded to an increase in productivity, grew the personal wealth of the specialists and was the root of distinct social classes.
