Answer:
Trade between the Song dynasty and its northern neighbors was stimulated by the payments Song made to them. The Song set up supervised markets along the border to encourage this trade. Chinese goods that flowed north in large quantities included tea, silk, copper coins (widely used as a currency outside of China), paper and printed books, porcelain, lacquerware, jewelry, rice and other grains, ginger and other spices.
Step-by-step explanation: