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That you can make a mental model of it good enough to make a prediction and observe the evidence that the prediction is true.  Same standard that applies to self-interest as the principal motivation for human behavior.  There aren't many good models of altruism that explain much about what happens in the real world.  But there are lots of good models of self-interest and lots of evidence to back them up.
by santiago on Sun Mar 1st, 2009 at 10:57:09 PM EST
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