The choice of invoicing currency for trade is crucial for the international transmission of macroeconomic policy. This paper develops a three-country model that endogenizes the choice of invoicing currency and that allows for a share of Örmsícosts to be denominated in foreign currency, consistent with the empirical evidence on the high degree of pass-through to import prices. Invoicing decisions are driven by Örmsídesire to hedge costs but also by exchange rate volatility and currency comovements. The model is tested empirically with a data set that spans ten currencies and 24 reporting countries, conÖrming the importance of currency comovements for the decision to invoice in vehicle currency. The Öndings also imply that if the U.S. share of world output continues to fall, other currencies will increasingly replace the U.S. dollar as an international vehicle currency.