Advancing with the Brazilian proposal would be wasting an opportunity, said Kestelboim Argentina's Ambassador to Mercosur Mariano Kestelboim Sunday said he favoured “a new common external tariff that promotes productive development.” Kestelboim, an economist by profession and also Ambassador to the Latin American Integration Association (Aladi), an entity made up of the countries of South America (except Guyana and Suriname) plus Mexico, Cuba and Panama, explained in an interview with the newsagency Télam that the regional bloc ”needs a new Common External Tariff (CET) that adjusts to the current productive characteristics and in turn, promotes the development of regional capacities.