When Valuators Use a Weighted Average Cost of Capital (WACC) to Determine a Discount Rate, the Rate Needs to Be “Iterated.” Here’s Why. When an expert determines a discount rate for a controlling interest in a valuation using the Weighted Average Cost of Capital (WACC), that discount rate needs to be iterated. Since market values of debt and equity in a closely held company are not publicly traded and known, as Richard Claywell explains, the iteration process is necessary.  It’s the only way to demonstrate the validity of using an industry average capital structure.  Without iteration your discount rate—and proposed…