Question

What is the variance of the idiosyncratic component of ibm excess returns?

Answer 1

we will look at the capital asset pricing model (CAPM), a simple but widely used factor model in finance. CAPM’s main strength – and its primary weakness – is that it assumes one single source of risk (i.e. market risk) and then buckets everything else as idiosyncratic (i.e. non-systematic). This paper will pave the way to more advanced factor modeling techniques in coming issues.