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OrphanWilde comments on [Link] “Proxy measures, sunk costs, and Chesterton's fence”, or: the sunk cost heuristic - Less Wrong
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While I agree with the post, I'm not sure that it's actually a strong defense of sunk costs as being more heuristic than fallacy; it depends upon your past self having more information than your current self. I believe the sunk cost fallacy is generally used to refer to the phenomenon where, having additional information that makes the original investment look like a bad idea, you proceed to additional investment instead of cutting loose.
That is, the sunk cost fallacy generally refers to a situation in which it is more or less explicitly stated that you have more information, rather than less. Starting from the assumption that you have less information in the future than in the past permits this reasoning, but the question becomes whether or not the assumption actually holds. My intuitive reaction is that it doesn't.
Or maybe you just spent more time thinking it through before. "Never doubt under pressure what you have calculated at leisure." I think that previous states should have some influence on your current choices. As the link says:
That presumes you've forgotten why you did something to begin with, your reasoning having created that information. Again, given the precise conditions, I think it's a perfectly fine argument. I just don't find those conditions more probable than the converse, which is to say, having more information.
Also remember the corollary that any decision made under pressure could probably stand to be reviewed at leisure.
Everybody does that anyway, it is usually called second-guessing yourself. The best rule is to not decide under pressure unless you really have to, take the time to think things through.