The average account balance of 401(k) investors that MassMutual administers fell 25% in 2008, but, nonetheless, participants are sticking with the plans. In fact, thanks to automatic enrollment, the number of employees contributing to their 401(k)s is on the uptick.An additional 10% of companies adopted auto enrollment in 2008, MassMutual said.

However, contribution rates have fallen by a slight 1.6 percentage points, with older Americans in particular cutting back on their contributions.

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