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I understand your pessimism on the data - however the source is Vanguard - the largest 401K trustee in the US. They claim to have analyzed 5M 401K accounts, which admittedly is a small number relative to the total, but it should be a large enough sample if the analysis was done correctly.Not sure about this one--mostly because, I've seen so many reports like this, and the numbers are all over the place--but uniformly low. So I believe it's correct, even if I question the number.
