Another piece in the social cooperation puzzle

<http://www.sciencenews.org/articles/20070714/mathtrek.asp>

In a model society with three types of participants - cheaters,
simple cooperators, and righteous cooperators who punish cheaters,
cooperation does not necessarily dominate. But add in a fourth type -
dropouts who choose not to even participate in the games - and now
cooperation (with or without punishment) may come to dominate.

Interesting, but I am beginning to think that by adjusting the
parameters in this kind of simulation you can get the results to
say whatever you want them to say.


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