The Pension Protection Act of 2006 is having a positive effect on 401(k) plans, Fidelity Investments said Wednesday.

Most notably, 51% of Fidelity’s 11.7 million 401(k) participants are in plans that have automatic enrollment, up significantly from 16% five years ago. Furthermore, 73% of the plans Fidelity administers default their participants into lifecycle funds up from 11% in 2006.

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