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The whole point of acausal trading is that it doesn't require any causal link. I don't think there's any rule that says it's inherently hard to model people a long way away.
Imagine being an AI running on some high-quality silicon hardware that splits itself into two halves, and one half falls into a rotating black hole (but has engines that let it avoid the singularity, at least for a while). The two are now causally disconnected (well, the one outside can send messages to the one inside, but not vice versa) but still have very accurate models of each other.
Yes, I understand the point of acausal trading. The point of my question was to speculate on how likely it is that quantum mechanics may prohibit modeling accurate enough to make acausal trading actually work. My intuition is based on the fact that in general faster than light transmission of information is prohibited. For example, even though entangled particles update on each others state when they are outside of each others light cone, it is known that it is not possible transmit information faster than light using this fact.
Now, does mutually enhan... (read more)