Not necessarily. Mere handfuls of funds attract much of the money. "Passive" investors – that is, indexers – have an especially narrow focus. Eighty-five percent of the dollars in S&P 500 index funds reside in just five funds.What's more, Jonathan Clements reports in the WSJ, investors in S&P 500 index funds appear to strengthen their advantage by exercising patience. As shown at right, they enjoy superior dollar-weighted returns, presumably because they better resist the impulse to buy high, sell low.
Will robo-advisers extend the advantage of patient investing to a wider range of wealth builders?




