To support its increased foreign trade, the shipping innovation which the Song Dynasty introduced was, watertight bulk heads.
While the Song Dynasty was characterized by financial problems and military weakness, it also experienced an economic expansion so great that it was referred to as the commercial revolution by certain scholars.
During the Song period the foreign trade was strengthened by overseas efforts. So improvements in the technology of shipbuilding and navigation assisted overseas commercial activities. Thus, Chinese vessels started utilizing oars, sails, and transverse water-tight bulkheads, to prevent ships from sinking.
Hence, Song dynasty mostly exported manufactured goods to other countries.
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