During Song dynasty, Chinese copper coins circulated not only within China but also across international borders. Along with the trade in goods, these coins traversed land and sea, facilitating the exchange of goods. Evidence of this is the large number of Song dynasty copper coins, which have been discovered not only in prosperous trading hubs along the South China coast, but also in Japan, Korea, Southeast Asia, Arabia, and other distant lands. Scholars believe that Song dynasty copper coins served as universal currency in transregional trade. The abundance of copper coins excavated at the site of Song Wong Toi Station testifies to the advanced commodity economy that existed then and also gives insight into the trading practices prevalent at that time.
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