401(k) fees: Net investment costs
The net investment cost, according to the "401k Averages Book," is the portion of the total investment cost that goes to the investment manager. Net investment cost is the one fee that doesn't vary much among participants, regardless of whether they are in small or large plans. But plan participants can exert the most control over this cost. For instance, they can choose cheaper index funds that mimic the market rather than buy more expensive actively managed funds that attempt to beat it.