Hudson talks about the history of money, with some good background on the debt theory of money, and money in ancient Mesopotamia. For the published work of Hudson on the origins of money, see here:
Hudson, M. 2003. “The Creditary/Monetarist Debate in Historical Perspective,” in S. A. Bell and E. J. Nell (eds), The State, the Market, and the Euro: Chartalism versus Metallism in the Theory of Money, Edward Elgar, Cheltenham. 39–76.The sound is not the best!
Hudson, M. 2004. “The Archaeology of Money: Debt Versus Barter Theories of Money’s Origins,” in L. R. Wray (ed.), Credit and State Theories of Money: the Contributions of A. Mitchell Innes, Edward Elgar, Cheltenham. 99–127.
Hudson, M. 2004. “The Development of Money-of-Account in Sumer’s Temples,” in M. Hudson and C. Wunsch (eds.), Creating Economic Order: Record-Keeping, Standardization, and the Development of Accounting in the Ancient Near East, CDL Press, Bethesda, MD. 303–329.