This paper provides new evidence on income and price elasticities of demand for agricultural exports from Mercosur countries to the EU. Econometric models are constructed for eight agricultural commodities - beef, cocoa, coffee, orange juice, poultry, sugar, soya and wheat - exported from Mercosur to the EU. A modelling approach based on the error correction mechanism is used in order to emphasise the importance of the dynamics of trade functions. The results indicate that there is a relatively weak demand response to income and price changes in the EU. However, the results also suggest that relative-price variations affect significantly the demand for Mercosur commodity exports, implying that the exporter's market share is influenced by price competitiveness.