Pat Gunning wrote: > What more sensible means would you suggest for building > models of interacting human beings than to use logic and > to assume that the beings you are modeling also use logic? Although I sympathize with Pat's point that such methods are useful, his (rhetorical?) question goes much too far. There are many other frameworks for thinking usefully about human interaction. I would include for example much social psychology (e.g., I do not think the "logical point of view" helps us improve our understanding of the Milgram experiment http://en.wikipedia.org/wiki/Milgram_experiment ). Of course economic imperialists will try to propose tastes and beliefs to cram this into their preferred modeling framework. Stigler and Becker, IMO, tore that approach apart thirty years ago. Cheers, Alan Isaac