Trade with the Chinese, circa 1000 AD. Social exchange is the key to human survival, whether this is for subsistence or relationship. From the earliest of times there has been evidence of exchanges between concentrations of populations. All this early trade was very sporadic. However, intense long-distance trade, indexed by high-fired ceramics, began in the 10th century AD. It is written that when the Chinese came in their junks to trade, people approached the ships via small boats, and carried off goods to be traded inland......