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Epler’s first comment is correct. The tax deductibility of interest payments provides a tax shield that adds value to the firm. The value of a tax shield is equal to the marginal tax rate times the amount of debt in the capital structure, so the higher the tax rate, the greater the value of the tax shield and the value of the firm, all else equal. Epler’s second comment is incorrect. If the costs of financial distress are also included in MM’s assumptions, we get the static-tradeoff theory, where the firm will have debt in its capital structure up to the point where the marginal cost of financial distress exceeds the marginal value provided by the tax shield.