We develop a three‐country two‐firm model to examine the superiority of most favored nation (MFN) vs tariff discrimination in global welfare by taking into account the cross ownership between exporters. We obtain several interesting results as follows. First, given cross ownership of financial interests and linear demand, the government of the importing country will impose a lower (higher) tariff on the low‐cost (high‐cost) firm and the global welfare under tariff discrimination will be higher than that under MFN, regardless of whether the mode of competition is Cournot or Bertrand competition, when the magnitude of cross ownership is relatively large compared with the cost difference. Second, given the cross ownership of corporate control and linear demand, the global welfare under tariff discrimination will be identical to that under MFN.