Bekaert, Geert; Hodrick, Robert J; Zhang, Xiaoyan - C.E.P.R. Discussion Papers - 2010
We examine aggregate idiosyncratic volatility in 23 developed equity markets, measured using various methodologies, and … we find no evidence of upward trends when we extend the sample till 2008. Instead, idiosyncratic volatility appears to be … relatively short duration. We also document that idiosyncratic volatility is highly correlated across countries. Finally, we …