The answer that I came with was, had an interest in the success of Rome, since they could improve their status by demonstrating their loyalty to their conquerors. I just learned about this over the summer semester when I took western civilization. Roman is rich in history but then again I think all countries are. :)
Answer:
Other trade goods included terracotta pots, gold, silver, metals, beads, flints for making tools, seashells, pearls, and colored gem stones, such as lapis lazuli and turquoise. There was an extensive maritime trade network operating between the Harappan and Mesopotamian civilizations.
Hope this helps!!! :)