Large-caps may be strong right now, but investors in for the long haul should consider staying small, according to a study from the Schwab Center for Investment Research, Dow Jones reports.

Although the Russell 2000 index, the go-to-gauge for the small-cap sector, suffered losses in May, not everyone is convinced the downturn is the start of a more pronounced plummet. The Schwab study sees 10.3% returns for small caps, compared to 8.6% for large-caps over the course of two decades. The study also projects 8.6% returns for international stocks and a 4.4% return on bonds over the same span.

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