Automatic enrollment into 401(k) plans is having the greatest impact on younger, lower-income workers, Fidelity Investments reported Tuesday.

Among the plans Fidelity manages, 52% of the participants who were automatically enrolled are between the ages of 20 and 34, and only 13% were between the ages of 50 and 64. Thus, Fidelity said, the impact of auto enrollment on older participants is not as significant, as many are either already participating or elect to enroll on their own.

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