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APMason comments on Problematic Problems for TDT - Less Wrong
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Two questions: First, how does is this distinction justified? What a decision theory is is a strategy for responding to decision tasks and simulating agents performing the right decision tasks tells you what kind of decision theory they're using. Why does it matter if it's done implicitly (as in Newcomb's discrimination against CDT) or explicitly. And second why should we care about it? Why is it important for a decision theory to pass fair tests but not unfair tests?
Well, on unfair tests a decision theory still needs to do as well as possible. If we had a version of the original Newcomb's problem, with the one difference that a CDT agent gets $1billion just for showing up, it's still incumbent upon a TDT agent to walk away with $1000000 rather than $1000. The "unfair" class of problems is that class where "winning as much as possible" is distinct from "winning the most out of all possible agents".