Trade problems faced by the food sector in Mercosur nations were highlighted again recently when Brazil erected trade barriers against dairy products from Argentina and Uruguay. This was the latest in a series of barriers imposed by Brazil in recent years which have had a detrimental effect on producers of beef, corn, wheat and other crops in Mercosur partner nations Argentina, Paraguay, and Uruguay. The food and agriculture sectors of member nations cannot live up to their potential until Mercosur is revitalised and new member nations join the block, argues Steve Lewis.