A general formula for the WACC: A correction
This paper corrects some of the equations of Farber, Gillet and Szafarz (2006). The WACC is a discount rate widely used in corporate finance. However, correctly calculating the WACC involves properly calculating the value of tax shields, and the value of tax shields depends on the company's debt policy. Many authors [e.g. Inselbag and Kaufold (1997), Booth (2002), Cooper and Nyborg (2006), Farber, Gillet and Szafarz (2006)] have stated that debt policy can only be implemented by maintaining a fixed market-value debt ratio (Miles-Ezzell's assumption) or a fixed dollar amount of debt (Modigliani-Miller's assumption).
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- Miles, James A & Ezzell, John R, 1985. " Reformulating Tax Shield Valuation: A Note," Journal of Finance, American Finance Association, vol. 40(5), pages 1485-1492, December.
- Cooper, Ian A. & Nyborg, Kjell G., 2006.
"The value of tax shields IS equal to the present value of tax shields,"
Journal of Financial Economics,
Elsevier, vol. 81(1), pages 215-225, July.
- Cooper, Ian A. & Nyborg, Kjell G., 2005. "The value of tax shields IS equal to the present value of tax shields," Discussion Papers 2005/14, Department of Business and Management Science, Norwegian School of Economics.
- Cooper, Ian & Nyborg, Kjell G, 2005. "The Value of Tax Shields IS Equal to the Present Value of Tax Shields," CEPR Discussion Papers 5182, C.E.P.R. Discussion Papers.
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