The average total plan cost for a small retirement plan declined from 1.46 percent to 1.44 percent of plan assets over the past year, but the total plan cost for a large retirement plan, over 1,000 participants, remained flat at 1.03 percent, according to the 14th Edition of the 401k Averages Book.

Small plans are those with 50 participants and $2.5 million in assets.

"In most of our fee benchmark scenarios we saw a decline in total plan costs and investment fees on a year-over-year basis," said David Huntley, co-author of the 401k Averages Book.

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