exported surplus goods and brought in goods t
hat were in short supply.
Copper, tin, gold, silver and precious metal
s were brought from outside, possibly from
Mesopotamia (Modern Iraq), Persia (Modern Iran), Oman and Afghanistan
Trading links with Mesopotamia have been proved by the discovery of Mesapotamian seals in many Harappan cities and Harappan seals in the cities of ancient Mesopotamia.
- The overseas trade was perhaps carried on from Lothal, w here a dockyard for ships has been found.