Since Dixit (1984), it is well accepted that a home country's best policy is to ban imports in an oligopolistic market if the resulting monopoly has a cost advantage over imports. This note (i) provides a formal proof and (ii) extends this result to symmetric firms. When domestic instruments are available, the optimal policy in a non-cooperative game is to subsidize local production such that it completely replaces imports. This policy is also globally first-best. (C) 2016 Elsevier B.V. All rights reserved.