"The federal Thrift Savings Plan (TSP) is a 401(k)-like plan for federal workers. It is often portrayed as a standard for all participant-directed retirement plans. But as testimony by the [GAO] makes clear, the TSP is a unique arrangement that cannot be compared with or duplicated by 401(k) plans. While the TSP works similarly to a 401(k) plan, fees charged to TSP participants are considerably lower than the average fees charged to participants in private-sector 401(k) plans. This cost differential reflects the unique economics of the TSP, which bear little resemblance to those of its private-sector counterparts."