This paper analyses the use of transfer pricing as a strategic device in divisionalized firms facing duopolistic price competition. When transfer prices are observable, both firms’ headquarters will charge a transfer price above the marginal cost of the intermediate product to induce their marketing managers to behave as softer competitors in the final product market. When transfer prices are not observable, strategic transfer pricing is not an equilibrium and the optimal transfer price equals the marginal cost of the intermediate product. As a strategic alternative, however, the firms can signal the use of transfer prices above marginal cost to their competitors by a publicly observable commitment to an absorption costing system. The paper identifies conditions under which the choice of absorption costing is a dominant strategy equilibrium.