We estimate the influence of trade preferences granted by Argentina on the origin of its imports. We try to identify if changes in Argentina's trade policy toward a set of countries had a differential effect, depending on whether goods were already traded, or on the contrary, if tariff changes affected mostly imports of new goods. We distinguish between the effects of changing tariffs and changing trade preferences. The econometric evidence shows that the effect of changes in tariff preferences on the probability of Argentina importing from other Asociacion Latinoamericana de Integracion (ALADI) members has been rather small, with most of the effect being explained by changes in tariff rates levied on imports from these countries. This result is stronger in the case of imports from Brazil.