Bartram, Söhnke M. - 2017
From 1963 through 2015, idiosyncratic risk (IR) is high when market risk (MR) is high. We show that the positive … relation between IR and MR is highly stable through time and is robust across exchanges, firm size, liquidity, and market …-to-book groupings. Though stock liquidity affects the strength of the relation, it is strong for the most liquid stocks. The relation …