We estimate the causal effects of a shift in the expected future exchange rate of a local currency against the US dollar on a representative sample of firms in an open economy. We survey a nationally representative sample of firms and provide the one-year-ahead nominal exchange rate forecast published by the local central bank to a random sub-sample of firm managers. The treatment is effective in shifting exchange rate and inflation expectations and perceptions. These effects are persistent and larger for non-exporting firms. Linking survey responses with administrative census data, we find that the treatment affects the dynamics of export and import quantities and prices at the firm level, with differential effects for exports to destination countries that use the US dollar as their currency. We instrument exchange rate expectations with the variation induced by the treatment and estimate a positive elasticity of a future expected depreciation in import expenditures.