Profession of faith
Prayer
Alms
Fasting
And Pilgrimage
Well they'd need to import, which would cause them to lose money, so they'd have less money, and so they'd be affected in that way. Also, they can't make their own goods.
Large amounts of roman coins found in chang’an market are the artifacts that would be most useful for a historian trying to determine the volume of trade between europe and china along the silk roads. The physical characteristics of the roman coins and the distribution have already been acknowledge in very considerable detail and much attention has been paid for the relevance to economic history.