Equity mutual funds suffered redemptions in 2008, only the third time in their history that they have had outflows. Actively managed funds lost $221.08 billion, while index funds took in $17.6 billion.

“Some people who get their hands burned by these market drops move from active to passive [management], and every time some of them stay there,” Scott Burns, an analyst with Morningstar, told Dow Jones. Passive investing “gains more converts” each time the market crashes.

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