Your friend might want to take a look at M.I. Finley's The Ancient Economy (here's an Amazon link: http://www.amazon.com/Ancient-Economy-Sather-Classical-Lectures/dp/0520219465/ref=sr_1_3?ie=UTF8&qid=1376494820&sr=8-3&keywords=M+finley) or his Economy and Society in Ancient Greece (an ABE link: http://www.abebooks.com/servlet/SearchResults?an=Finley&sts=t&tn=The+Ancient+Economy).

Don Coffin
________________________________________
From: Societies for the History of Economics [[log in to unmask]] on behalf of Alan G Isaac [[log in to unmask]]
Sent: Wednesday, August 14, 2013 8:46 AM
To: [log in to unmask]
Subject: Re: [SHOE] QUERY: ancient money

On 8/14/2013 8:12 AM, [log in to unmask] wrote:
> http://www.psychologytoday.com/blog/cultural-animal/200807/the-evolution-economic-rationality-do-monkeys-understand-money


Related is the research on fairness in exchange:
http://www.youtube.com/watch?v=lKhAd0Tyny0

Alan Isaac