If you invested dispassionately, using an objective analysis of the historical data, you would invest in a globally diversified portfolio of index funds with low management fees. It’s not that you can’t beat the market by investing in actively managed funds. Every year, some mutual funds outperform their benchmark. However, their probability of doing so over the long term is relatively low. Over a 20-year period, about 80 percent of actively managed funds will underperform their benchmark, Charles Ellis wrote in a 2012 article published in Financial Analysts Journal.
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