What characteristics of early sumer civiliztion provide evidence of a traditional economy

Sumer civilization is considered the most primitive civilization known in the region of Mesopotamia, today southern Iraq. This civilization’s trade exhibited features that could provide evidence of a traditional economy. Among such characteristics it is possible to list the following:

First,  to the Sumerian city of Ur imports of all types of metal came from many parts of the world. In addition, trade with far lands for goods that were rare in Mesopotamia was referred in the poem from the antique Mesopotamia the Epic of Gilgamesh. Finally, large institutions kept their accounts cereal and silver and prices were usually denominated in one of them.