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James K. Glassman, Contributing Columnist, Kiplingers Personal Finance

Index funds benefit investors in other ways besides low fees. Trading expenses and tax consequences are minimal.

John Bogle used to joke that investing in managed mutual funds was like a second marriage: Its the triumph of hope over experience. Bogle, an investment industry legend who died in January at 89, could have said the same about his own life. He survived at least six heart attacks and lived long enough to see the low-cost index fund–which he championed for 43 years at Vanguard, the firm he founded–go from an obscurity to a sensation. Moodys predicts that index funds will claim more than half of the assets in the investment-management business in the next two to four years. All by itself, Vanguard 500 Index (symbolVFIAX), which is linked to Standard & Poors 500-stock index, has a portfolio valued at $335 billion. (For more on Bogle, seeThe Legacy of John Bogle.)

The rationale for the stock market index fund rests in the efficient-market hypothesis, the notion that the value of a stock reflects everything thats known about it at the time. Under this theory, the future course of a stocks price cannot be predicted. Rather, it moves in what Princeton economics professor emeritus Burton Malkiel called a random walk, which was the subject of his influential bookA Random Walk Down Wall Street,first published in 1973. If markets are efficient, it is a waste of time and money to invest in a mutual fund run by a human being who picks stocks and bonds and charges you a significant fee for the effort. In the long term, a fund that reflects the whole market will beat managed funds because of two advantages: lower fees and immunity to the panic buying and selling of crowds.

Indexing works. The record of index funds validates this theory. In the 15-year period through June 30, 2018, Standard & Poors found that its S&P 500 index, composed of roughly the 500 largest companies on U.S. exchanges, beat 92.4% of large-cap funds. According to Morningstar, Vanguard 500 Index has done better than the majority of funds in its category (large-cap blend, a mix of growth and value stocks) in each of the nine calendar years through 2018. In the five years ending February 15, Vanguard 500 Index returned an annual average of 10.8%, nearly two percentage points a year more than large-cap blend funds, which returned an annualized 9.1%.

Index funds benefit investors in other ways, too. Only a handful of companies in the S&P 500 change each year, so trading expenses and tax consequences are minor.

The competition for index investors has become intense. Last year, Fidelity launched a new series of funds with no fees at all, including ZERO Large Cap Index (FNILX), which is linked to Fidelitys own index of 504 stocks that are nearly the same as those in the S&P 500. Vanguard charges just 0.04% for its 500 Index fund. (The firm recently closed the more expensive Investor share class of the fund to new investors, allowing Investor share class owners to convert to Admiral shares with just a $3,000 minimum investment.) Expenses are also 0.04% for shares of Vanguard S&P 500 (VOO), the firms exchange-traded fund, and 0.09% for SPDR S&P 500 (SPY), the most popular index ETF. A growing number of ETFs now trade commission-free.

The average managed large-cap fund has an expense ratio of 0.65%, according to Morningstar, so to beat an index fund that charges 0.04%, a typical active manager would need to outperform by 0.61 percentage point. Thats not easy.

ISO excellence. The question, however, is not whether a fund that will beat the index over the next five years exists. Of course it does. The question is whether you can find it. As analyst Mark Hulbert has written, Im not aware of any way of identifying in advance the select funds that will be able to beat the market over the long term. One method that seems bound to fail is betting on funds that are doing well today. A study by S&P found that out of 550 domestic equity funds that were in the top quartile [that is, the best-performing 25% of funds] as of September 2016, only 7.1% managed to stay in the top quartile at the end of September 2018.

Still, some active managers seem to have a golden touch. Fidelity Contrafund (FCNTX), run by Will Danoff since 1990 and carrying an expense ratio of 0.74%, has returned an annual average of 10.5% for the past 15 years, compared with 8.3% for Vanguard 500 Index–and with similar risk. And theres Warren Buffett, of course. The chairman of Berkshire Hathaway (BRK.A) has had enormous success by finding inefficiencies in the pricing of individual companies. Id be a bum on the street with a tin cup if the markets were always efficient, he once said.

Trying to find funds–or putting together your own portfolio of individual stocks, for that matter–that can beat the indexes can be exciting, an intellectual challenge. And you certainly wont beat the index with an index fund. But even Buffett is an index fund advocate. In the 2013 Berkshire Hathaway annual report, he said he would give this advice to a trustee for his own children: Put 10% of the cash in short-term government bonds and 90% in a very low-cost S&P 500 index fund. (I suggest Vanguards.) I believe the trusts long-term results from this policy will be superior to those attained by most investors–whether pension funds, institutions or individuals–who employ high-fee managers.

The S&P 500 is not the only index that reflects the stock market as a whole. You can get even broader exposure through funds such as Vanguard Total Stock Market Index (VTSAX), which reflects the performance of every exchange-listed U.S. stock and charges 0.04%. Although the S&P 500 index itself has about 10% of its assets in mid-cap stocks, the Total Stock Market fund has 17% in mid-cap stocks and 6% in small caps. Like the 500 Index fund, Total Stock Market is capitalization weighted, so the smallest companies have little impact on the price of the fund and the largest dominate–but not quite as much as with an S&P 500 fund. The three top holdings at the end of 2018 for the two funds were, naturally, the same–Microsoft (MSFT), Apple (AAPL) and (AMZN)–but they represented 10% of the assets of 500 Index and 8.3% of Total Stock Market.

Over the past 15 years, Total Stock Market has beaten Vanguard 500 Index by an annual average of three-tenths of a percentage point. The broader fund, with its mid and small caps, is slightly riskier–and more risk should yield greater rewards.

With about 2,500 holdings (Vanguard Total Stock Market has 3,500), Fidelity ZERO Total Market Index (FZROX) does the same job and charges no expenses. The only catch with these zero-fee funds is that you have to open a Fidelity brokerage account. If you prefer an ETF, good choices are Vanguard Total Stock Market (VTI), charging 0.04%, and iShares Core S&P Total U.S. Stock Market (ITOT), holding about 3,400 stocks and charging 0.03%.

How do you choose between an S&P 500 and a total-market fund? Over the past 10 years, the widest annual variance between the two Vanguard funds has been just two percentage points. But last year, in an attempt at streamlining, Vanguard removed the 500 fund as a selection for its employees 401(k) plan. We believe the Total Stock Market Index fund is the best proxy for the U.S. market, offering exposure to large-, mid- and small-cap stocks, said a spokesperson. My own view is that it makes no difference. Just bear in mind Bogles bon mot (attributed originally to Samuel Johnson), and pick experience over hope.

Copyright 2019 The Kiplinger Washington Editors

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