Inertia Is Not the Only Reason 401(k)s Rarely Use ETFs
The limited presence of ETFs in defined-contribution plans is not explained solely by investor preference or product cost. Many record-keeping systems were built around mutual funds and cannot easily accommodate ETF trading and accounting.
- Some 401(k) plans already offer very inexpensive mutual funds
- ETF costs alone do not determine plan adoption
- Legacy record-keeping infrastructure favors mutual funds
- Institutional systems can delay otherwise attractive innovations
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