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Clay tokens, an ancient system used to record goods changing hands.
(Part 3 of 7)
Playlist Link - http://www.youtube.com/playlist?list=PL18FC35BAE7676C38
Transcript link - http://media-podcast.open.ac.uk/feeds/mst121-sundials/transcript/mst121.02_track_4_00518_6458.pdf
For more information about recording sales in clay tablets visit http://www3.open.ac.uk/study/undergraduate/course/mst121.htm