Here’s what you are looking for: A low-cost index fund. For tax-advantaged funds you’ll be holding for decades, I slightly prefer a total stock market index fund but an S&P 500 index fund is just fine. You can also look for a total bond market index fund if your needs or preferences call for it. Most plans will also offer these. TRFs (Target Retirement Funds) are frequently offered in 401(k) plans and these can be an excellent choice. But look closely at the fees. They are always higher than those for index funds, sometimes by a lot. For instance, the TRFs from Vanguard have expense ratios
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