The Capital Structure Puzzle: The Evidence Revisited

Since the formulation of the M&M propositions almost 50 years ago, financial economists have been debating whether there is such a thing as an optimal capital structure-a proportion of debt to equity that maximizes shareholder value. Some finance scholars have followed M&M in arguing that both capital structure and dividend policy are largely "irrelevant" in the sense that they have no significant, predictable effects on corporate market values. Another school of thought holds that corporate financing choices reflect an attempt by corporate managers to balance the tax shields and disciplinary benefits of greater debt against the costs of financial distress. Yet another theory says that companies do not have capital structure targets, but simply follow a financial "pecking order" in which retained earnings are preferred to outside financing, and debt is preferred to equity when outside funding is required. 2005 Morgan Stanley.