One of his most provocative views in a recent Bloomberg interview is that the recent flood of money into index funds has parallels with the pre-2008 bubble in collateralized debt obligations, the complex securities that almost destroyed the global financial system.
“Central banks and Basel III have more or less removed price discovery from the credit markets, meaning risk does not have an accurate pricing mechanism in interest rates anymore. And now passive investing has removed price discovery from the equity markets. The simple theses and the models that get people into sectors, factors, indexes, or ETFs and mutual funds mimicking those strategies -- these do not require the security-level analysis that is required for true price discovery.