Note: This article is part of Morningstar's 2018 Portfolio Tuneup week. A version of this article appeared on March 31, 2017.
Investors often look to Morningstar for a definitive answer on whether they should employ actively managed mutual funds or simple low-cost index funds and exchange-traded funds.
Christine Benz does not own shares in any of the securities mentioned above. Find out about Morningstar's editorial policies.