EVALUATING PRODUCT MIX AND CAPITAL BUDGETING DECISIONS WITH AN ACTIVITY-BASED COSTING SYSTEM

Product mix and the acquisition of the assets needed for their production are interdependent decisions. However, these decisions are frequently evaluated independently of each other and with conceptually different decision models. This article expands activity-based costing (ABC) to incorporate the cost of capital. The resulting model traces the cost of capital to products and thereby measures the economic value added (EVA) from their production. The discounted value of a product’s EVA over its life is equivalent to its net present value (Hartman, 2000; Shrieves & Wachowicz, 2001). The discounted EVA of a product also equals the net present value of the assets used to manufacture the product. Consequently, evaluating products with an ABC model incorporating the cost of capital enables product mix and capital budgeting decisions to be evaluated simultaneously. The article also examines the role of ABC when product mix decisions are made at the product and portfolio levels of the firm’s operations.