Money quote from a new paper by The Employee Benefit Research Institute:

Those with low account balances relative to contributions experienced minimal investment losses that were typically more than made up by contributions: Those with less than $10,000 in account balances had an average growth of 40 percent during 2008, since contributions had a bigger impact than investment losses. However, those with more than $200,000 in account balances had an average loss of more than 25 percent.

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