--The rule of thumb for 401(k) plans during market volatility is to, in fact, do nothing. As this best practices guide from T. Rowe Price explains.

Many of us have just seen our 401k claw back to what they were pre-2008 crash. The crash that is unfolding will be deeper and longer than our previous recession.

It's time to cash out.

401k Funds have been a dumping ground of bad stocks for their respective institutions. There is a reason why 401k funds seem to crash harder and take longer to recover. They know that 90% will do nothing as the market declines.