Even in the era of index funds, humans have fundamental investing advantages that no machine will ever replace. So says Will Danoff, manager of Fidelity Investments’ $108 billion Contrafund, the biggest actively managed stock or bond mutual fund run by one person.

Since he took over on September 17, 1990, Contrafund has averaged a 12.7% return annually, according to Morningstar, outperforming the S&P 500 index by 2.9 percentage points a year.