Fed: LETFs Contribute To Stock Volatility
LETFs (leveraged exchange traded funds) may contribute to stock volatility in the same way that portfolio insurance contributed to the 1987 stock market crash, according to recent research done by Tugkan Tuzun at the U.S. Federal Reserve. He argues that the same positive feedback loops, especially during the final hour of trading, exacerbate high volatility, though it may not have a significant effect on the market during times of relative stability.