The choice between the textbook and MM-APV approaches to capital budgeting analysis depends on whether it is (1) the debt-repayment schedule or (2) the leverage ratio that is exogenous with respect to realized market values. The
general perfect capital markets MM-APV model is neutral with respect to the
firm's financing policy, but it requires explicit valuation of the tax benefits of debt financing. The textbook approach is a special case of the general MM APV model when the leverage ratio is exogenous, and it enables the firm to value