What characteristics of the early sumerian civilization provide evidence of a traditional economy

The principal characteristic of traditional economy is:

An agrarian structure of self-supply, using exchange of goods as commercial relationships in the society, this exchange are within the community. In few words, is the economy based in subsistence.

With this in mind, we can say that early summerian civilization was based on traditional economy, because it had mainly a self-sufficient agricultural base for basic food and housing conditions, also, the animal breeding was used to take care of the primary needs of its inhabitants. They were an agrarian society that used exchange to provide themself with the goods they need and couldn't cultivate.