There is an interesting program located here:

http://www.pdc.kth.se/~ssim/Simulation.html

The program is simplistic, using "food" and "gold" as the only two commodities. Actors are very limited in their actions, and allotment of each good is random. However, it is worth checking out, as it models what we are trying to do--only in a more simplistic manner.

A detailed description of the model is presented in a paper by Ken Steiglitz, Michael Honig, and Leonard Cohen, located at:

http://www.cs.princeton.edu/~ken/scott.pdf