From 1963 through 2015, idiosyncratic risk (IR) is high when market risk (MR) is high. We show that the positive … relation has roots in fundamentals as higher market risk predicts greater idiosyncratic earnings volatility and as firm …

Since 1965, average idiosyncratic risk (IR) has never been lower than in recent years. In contrast to the high IR in … idiosyncratic risk. Models that use firm characteristics to predict firm-level idiosyncratic risk estimated over 1963-2012 can …