* The upper class, consisting of priests, nobles, and wealthy landowners, who held the most power and influence in society.
* The middle class, consisting of merchants, artisans, and skilled workers, who made up the majority of the population.
* The lower class, consisting of slaves and unskilled workers, who were at the bottom of the social hierarchy and had few rights or privileges.
Each social class had its own distinct roles and responsibilities, and there was little social mobility between the classes. The upper class was responsible for governing the city-states and maintaining social order, while the middle and lower classes were responsible for producing goods and services and providing labor for the upper class.
Slavery was a common practice in Sumer, and slaves were often used for manual labor or as domestic servants. Slaves could be bought and sold, and they had no legal rights or protections. They were considered to be the property of their owners, and they could be beaten or even killed with impunity.
The social structure of Sumer was based on a system of patron-client relationships, in which the upper classes provided protection and support to the lower classes in exchange for their loyalty and service. This system helped to maintain social order and stability in Sumerian society.