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Wei_Dai comments on You can't signal to rubes - Less Wrong
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I seem to recall seeing some game theoretic signaling models with wasteful pooling equilibria, where everyone sends the same costly signal and the receiver can't distinguish between the senders of different qualities. Can't find a specific model now, but here is a slide that mentions this fact on page 20.
One of the original tag-based cooperation papers features a scenario where signal-based cooperation persists - despite regular forgery of the signals used. See:
Potlach?