Evaluation of Joanna Cohen's WACC Calculation
Cohen's WACC calculation is decent, but has a few issues, and a number of errors, as described below. •Weighting the capital structure. She weights the capital structure using the book value of equity. Nike is a public company, and its market capitalization is a more relevant metric for equity than the book value of equity. •Cost of debt. To calculate the cost of debt, Cohen simply divides the interest expense by the average balance of the interest-bearing debt. This is an approximation for the true cost of the debt, but is too inaccurate. The interest expense line may include expenses not directly related to the debt of the company (unlikely, but perhaps non-cash payment-in-kind expenses for the preferred stock, or simply interest expense recognized under GAAP, but not necessarily indicative of real costs of debt). The cost of debt should include the current market yield on Nike's publicly traded debt, as this is a more pertinent metric. Furthermore, Cohen uses the 20 year yield on treasury bonds to approximate the risk free rate. We feel that the 3-month yield on treasuries is appropriate.