The citation is taken from "Brinkmanship in Business"[pdf]. The cited assertion is actually a mistake, as it presupposes that the right thing to do in the Ultimatum game is to accept any amount offered to you, and never punish the unfair dealer. The whole document is a lesson in Dark Arts.
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A monthly thread for posting any interesting rationality-related quotes you've seen recently on the Internet, or had stored in your quotesfile for ages.