The Department of Labor estimates that automatic enrollment in 401(k) plans, as protected under the Pension Protection Act, will add between $45 billion to $90 billion a year to the plans, which had $3.6 trillion in assets under management in 2006, according to the Investment Company Institute.

But there's another factor at play that will give a tremendous boon to 401(k) administrators and providers, and that is the demise of the $2.2 trillion private pension industry.

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