Retirement plan fees are complex, involving administration, investment management, recordkeeping, consulting, and various types of revenue sharing fees. Plan fiduciaries are required to ensure fees are reasonable based on ERISA Section 408(b)(2). Key factors that impact plan pricing include the number of participants, average account balances, services required, and plan design features. Revenue sharing includes payments from investment managers to service providers and must be properly understood and monitored by fiduciaries to ensure only reasonable fees are paid based on prudent practices like annual benchmarking and live-bid benchmarking every three years.