In light of these costs, it seems that a winning strategy would be to relax and play it safe, lettings others do all the work to gather new information. If they’re just going to share it with you anyway, as an act of altruism, why bother? But that’s not the instinct we find in the human animal. We aren’t lazy, greedy listeners. Instead we’re both intensely curious and happy to share the fruits of our curiosity with others. In order to explain why we speak, then, we have to find some benefit large enough to offset the cost of acquiring information and devaluing it by sharing. If speakers are
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