I’m just trying to help so hopefully this did help;-)
A resource will always have value as long as people are willing to pay for it. This happens because the resource is sought after which means people see worth in this resources. One example of this are precious minerals which have no apparent reason why anyone would consider them expensive other than the fact that peopl are willing to pay for them.
B. It involved exchanges with traders from China and Southwest Asia. So they aimed to control the trading routes rather than having subjects.
