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AlephNeil comments on Open Thread, April 2011 - Less Wrong
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By 'negative-sum' do you really mean 'negative for all parties'? Because, taking 'negative-sum' literally, we can imagine a variant of the Prisoner's Dilemma where A defecting gains 1 and costs B 2, and where B defecting gains 3 and costs A 10.
I suppose I meant "Pareto-suboptimal". Sorry.
How does that make sense? You are correct that under sufficiently generous Coasian assumptions, any attempt at predation will be negotiated into a zero-sum transfer, thus avoiding a negative-sum conflict. But that is still a violation of Pareto optimality, which requires that nobody ends up worse off.
Yes, this was a confusion on my part. You are right that starting from a Pareto-optimal state, a pure transfer results in another Pareto-optimal state.