Just because you are invested in index funds in your 401 (k) doesn't mean you should set it and forget it. (cnbc.com)
Understanding the PE Ratio Most investors are best suited to invest in a diversified portfolio of index funds in an asset allocation in line with their risk tolerance. (barbarafriedbergpersonalfinance.com)
For me, I prefer to invest in mainly low cost index funds with expense ratios that are much lower. (biblemoneymatters.com)