Volatility Decomposition - Empirical Patterns of the Idiosyncratic Risk on the Swedish Stock Market
We decompose total stock market volatility into market-, industry- and firm-specific components to empirically explore if and how the level of idiosyncratic volatility has changed over time. The econometric methods of Campbell, Lettau, Malkiel and Xu (2001) are applied to the Swedish stock market 1985 to 2004. We find evidence for an upward trend and show that there is a significant increase in id