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mwengler comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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Some references in a review of Ridley's Rational Optimist describing claims about Apes not being able to barter and exchange the way humans do.
Not quite on the apes but this [wsj article by Matt Ridley[(http://online.wsj.com/articles/SB10001424052748703691804575254533386933138) talks about how exchange was the unique innovation of humans that caused our achievements and that evidence is that Neanderthals didn't have exchange the we did.