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Trade developed early and was very important to the people of Sumer because they?

Verified Answer :

Trade was important to the Sumer because there certain
resources that the Sumerians didn’t have.
These were stone, wood and metals like copper.  Due to this lack of resources, the Sumerians
establish trade with other tribes as well as merchants.  One is when inhabitants of the Zagros and Taurus
mountains bartered traded timber, limestone, gold, silver and copper with the
Sumerians.  The Sumerians gave them wheat
and barley in exchange.  Apart this,
boats were developed enabling them to transport goods for trade.

Lacked needed natural resources such as stone, wood, and metal.