Hot Funds and the Curse of 'Self-Inflated Returns'

When billions of dollars gush into an ETF that just reported big gains, more gains can soon follow. The problem: The investors themselves are driving those gains—and will suffer when their impact fades.

When billions of dollars gush into an ETF that just reported big gains, more gains can soon follow. The problem: The investors themselves are driving those gains—and will suffer when their impact fades.