I won’t pretend to be an expert in economics but here is a fairly straightforward, if lengthy, video about the evolution of money and the concept of debt. Toward the end the video gets less historical/documentary and more polemic, but it is also prescient, since this was uploaded Feb 2007.
Let me know what you think.
http://video.google.com/googleplayer.swf?docid=-9050474362583451279&hl=en&fs=true
Alex Reid 