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Fama, E. F., & French, K. R. (1993). Common Risk Factors in the Returns on Stocks and Bonds. Journal of Financial Economics, 33, 3-56.
https://doi.org/10.1016/0304-405x(93)90023-5

has been cited by the following article:

• TITLE: A New Model of Capital Structure Based on Portfolio Theory

  AUTHORS: Said T. Ebied

  KEYWORDS: Capital Structure, Efficient Market, Efficient Portfolio, Optimal Mix of Debt and Equity, MM Propositions, Pecking Order Theory, Trade off Theory

  JOURNAL NAME: American Journal of Industrial and Business Management, Vol.15 No.8, August 27, 2025

  ABSTRACT: In this paper, a theoretical model is introduced to solve for the optimal weights of debt (bonds) and equity (stocks) that determine the minimum weighted average cost of capital (WACC), which in turn leads to maximizing the value of the firm. The model uses a Lagrangian function to determine the optimal weights that minimize risk for a given level of return. The model’s unique contribution is its direct application of the efficient portfolio framework, typically used for investment management, to a firm’s capital components by treating debt and equity as a two-security portfolio. Empirical results of the model using real-world data show the robustness of the model in obtaining the optimal WACC.