Changes

===The Impact of Song Paper Currency===

The impact of the invention/discovery of paper currency during the Song Dynasty was profound to say the least. Although the concept never made its way to the West, it indeed spread throughout east Asia during the Middle Ages. The Jurchen Jin Dynasty, which ruled northern China from 1127 to 1234, issued paper notes in the mid-1150s based on the notes the Song rulers originally issued in Sichuan and later issued other notes that were tied to silver, as the Southern Song had done. <ref> Glahn 2010, p. 469, 472</ref>