Why is the computation of cost of capital likely to be higher under the Fama-French model than the CAPM?

Question

Quizplus · Accepted Answer

The Fama-French model includes two additional factors, namely size and value, that are not accounted for in the CAPM. The inclusion of these two factors increases the complexity of the model and therefore the computation of cost of capital is likely to be higher in the Fama-French model than the CAPM.

Why Is the Computation of Cost of Capital Likely to Be