What you say sounds right, Alex; I'm just thinking of a large-N problem
where the selfishly optimal strategy is 0 contribution.  For air
pollution, that sounds pretty reasonable, doesn't it?
-- 
                        Prof. Bryan Caplan                
       Department of Economics      George Mason University
        http://www.bcaplan.com      [EMAIL PROTECTED]

  "[T]he power of instruction is seldom of much efficacy, except in 
   those happy dispositions where it is almost superfluous." 
   -- Edward Gibbon, *The Decline and Fall of the Roman Empire*

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