写这个帖子起因是Michael Burry 的采访：
Active money managers have bled assets in recent years as investors rebelled against high fees and disappointing returns – a trend that prompted Moody’s Investors Service to predict that index funds will overtake active management in the U.S. by 2021. The shift has coincided with a multiyear stretch of underperformance by value stocks and, more recently, by small-caps.
“The bubble in passive investing through ETFs and index funds as well as the trend to very large size among asset managers has orphaned smaller value-type securities globally,” Burry, whose Cupertino, California-based firm oversees about $343 million, wrote in an emailed response to questions from Bloomberg News.
Bogle Sounds a Warning on Index Funds
Most observers expect that the share of corporate ownership by index funds will continue to grow over the next decade. It seems only a matter of time until index mutual funds cross the 50% mark. If that were to happen, the “Big Three” might own 30% or more of the U.S. stock market—effective control. I do not believe that such concentration would serve the national interest.