In what circumstances might it be necessary to implement agent-based  models of thousands or millions of agents, rather than the more typical tens or hundreds?  Do you know of any examples where scaling up the model (in terms of the number of agents) gives qualitatively different results?  Do you know of any literature that addresses this issue?

I’d be very interested to hear of any suggestions.

Thank you,


Professor Nigel Gilbert,  Editor, Journal of Artificial Societies and
     Social Simulation, <>
        Centre for Research on Social Simulation (CRESS)
   Department of Sociology, University of Surrey, Guildford, UK.
       Tel:+44 1483 689173   [log in to unmask]">[log in to unmask]